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Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
7
“O estudo é glorioso, primeiro porque purifica os costumes dos homens,
segundo porque proporciona o benefício da cultura." Cassiodoro
1. Grandezas e Medidas
1)Determine a medida do complemento dos ângulos cujas medidas são:
a) 30° ___________ b) 50° ___________ c) 15° ___________ d) 67° ___________
2)Determine a medida do suplemento dos ângulos cujas medidas são:
a) 120° ___________ b) 43° ___________ c) 30° ___________ d) 95° ___________
3) Utilizando o transferidor, meça e classifique os seguintes ângulos:
a) b)
Medida: ______________________ Medida: _______________________
Classificação:__________________ Classificação: __________________
c) d)
Medida: ______________________ Medida: _______________________
Classificação:__________________ Classificação: __________________
4) Calcule as medidas desconhecidas dos ângulos das figuras abaixo:
a) 2x + 25° b)
4x
x – 5° x
x = ________________ x = __________________
c) d)
x + 15°
48°
3x - 5° x
x = _______________________ x = _______________________
3x + 20°
Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
8
5) Sendo OC a bissetriz de AÔB, calcule x:
A • C •
X
60°
O B
6 - Observando cada figura, dê a medida x indicada:
7) Na figura abaixo, vamos calcular as medidas X, Y e Z indicadas:
8) Vamos determinar os valores para X e Y indicados na figura abaixo:
a) b)
9) Na figura abaixo, OM é a bissetriz do ângulo BOA
^
. Determine a medida x indicada:
C
Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
9
10) Analisando a figura do exercício anterior, determine a medida do ângulo AOC
^
.
11) Vamos calcular, em graus, a medida x indicada nas figuras.
2. Retas Paralelas
12) Na figura abaixo, identifique um par de ângulos:
13) Na figura abaixo, qual o nome dos seguintes pares de ângulos:
14)
Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
10
15) Nas figuras abaixo, determine o valor de x sabendo que r // s.
16) Nas figuras abaixo, determine o valor de a, sendo r // s:
17) Duas retas paralelas cortadas por uma transversal formam dois ângulos correspondentes
representados, em graus, por 5x + 20º e 2x + 50º. Determine o valor de x:
18) Duas retas paralelas cortadas por uma transversal formam ângulos colaterais internos expressos em
graus por
3x -50º e 2x -10º. Determine as medidas desses ângulos.
3. Produtos Notáveis
19) Complete a tabela:
a b (a + b)2
a2
+ b2
5 3
0 6
3 - 1
- 1 4
Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
11
O que você observou? ________________________________________________________________________
20) Calcule:
a) (x + 7)² = _________________________________________________________________________________
b) (5 + 2m)² = _______________________________________________________________________________
c) (3n + 2m)² = ______________________________________________________________________________
d) (7 + x)² = _________________________________________________________________________________
e) (5x2
+ 1)2
= _______________________________________________________________________________
f) (2bc + a)² = _______________________________________________________________________________
g) (x + 0,5)2
= _______________________________________________________________________________
h) (u + ½)2
= ________________________________________________________________________________
i) (2 – x³)² = ________________________________________________________________________________
j) (4t – 3u)² = _______________________________________________________________________________
l) (n – 6)² = ________________________________________________________________________________
m) (5x – 2y)² = ______________________________________________________________________________
n) (xy – 10)2
= _______________________________________________________________________________
o) (t – 0,2)2
= ________________________________________________________________________________
p) (x + 9) (x – 9) = ___________________________________________________________________________
q) (3x + 5) (3x – 5) = _________________________________________________________________________
r) (m2
– 6) (m2
+ 6) = _________________________________________________________________________
s) (2a + 5) (2a – 5) = __________________________________________________________________________
t) (w³ – 2) (w³ + 2) = _________________________________________________________________________
u) (4m + 3n) (4m + 3n) = ______________________________________________________________________
v) (0,3 – a) (0,3 + a) = ________________________________________________________________________
x) (x + ) (x – ) = __________________________________________________________________________
21) Simplifique as expressões:
a) (x + 1)² + (x + 2)² – (2x +1) = ________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
b) (2x + 1)2
+ (3x + 1)2
= ______________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
c) (x + 5)2
– x(x + 3) = _________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
d) (t – 4)2
– (x – 1)2
= __________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
12
e) (x + 1)2
– (x – 2)2
= _________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
f) ½[(x + 1)2
+ (x – 1)2
] = ______________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
g) (m – 1)2
– (m + 1)(m – 1) = ___________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
h) (x + 4)(x – 4) – (x – 4)2
= _____________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
22) (2a – 5b)² é o mesmo que:
a) 4a² – 20a²b² + 25b² b) 4a² + 20ab – 25b² c) 4a² + 20ab + 25b² d) 4a² – 20ab – 25b² e) 4a² – 20ab + 25b²
Resolução: __________________________________________________________________________________
23) A expressão (2n+1)² + (n+2)² + 2(n+1) (n-1) é igual a:
a) 7n² + 6n + 3 b) 7n² + 6n – 3 c) 7n² + 6n + 4 d) 7n² + 8n + 4 e) 7n² + 8n + 3
Resolução: __________________________________________________________________________________
___________________________________________________________________________________________
4. Fatoração
24) Fatore as expressões:
a) 7q2
– 28 = _______________________________ b) 33x + 22y – 55z = ______________________________
c) x6
+ x7
+ x8
= ____________________________ d) 36 cd + 6 cd2
= _________________________________
e) x(a + b) + y(a + b) = ______________________ f) 2a(x – 1) – b(x – 1) = ____________________________
g) 7a – 7c + ma – mc = _______________________ h) a3
+ 3a2
+ 2a + 6 = ______________________________
i) x3
– x2
+ 5x – 5 = __________________________ j) x2
– 36 = _______________________________________
l) 25 – a2
= _________________________________ m) 9x2
– 16 = _____________________________________
n) 9x2
– 16 = _______________________________ o) 1 – 81a2
= _____________________________________
p) 100 – π2
= ______________________________ q) 36x4
– y6
= _____________________________________
r) x2
+ 2x + 1 = ______________________________ s) x2
– 2x + 1 = ___________________________________
t) 1 – 6m + 9m2
= ___________________________ u) x2
+ 12x + 36 = _________________________________
v) 36a2
– 12ac + c2
= _________________________ x) y4
+ 4y2
+ 4 = __________________________________
25) Agrupe os termos e fatore:
a) 5x + ax + 5y + ay = _________________________________________________________________________
b) x3
+ 2x2
+ 7x + 14 = ________________________________________________________________________
c) c2
– c + cx – x = ____________________________________________________________________________
d) ax + bx + ay + by + az + bz = ________________________________________________________________
Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
13
26) Relacione as expressões equivalentes:
A) x(x + 5) ( ) 20x + 4
B) 5x + 10 ( ) 5(3x + 4)
C) x + 5x2
( ) x2
+ 5x
D) 4(1 + 5x) ( ) 5(2 + x)
E) 15x + 20 ( ) x(1 + 5x)
BOM ESTUDO!
Profª Renata Lorenzo
Anotações...
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  • 1. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 7 “O estudo é glorioso, primeiro porque purifica os costumes dos homens, segundo porque proporciona o benefício da cultura." Cassiodoro 1. Grandezas e Medidas 1)Determine a medida do complemento dos ângulos cujas medidas são: a) 30° ___________ b) 50° ___________ c) 15° ___________ d) 67° ___________ 2)Determine a medida do suplemento dos ângulos cujas medidas são: a) 120° ___________ b) 43° ___________ c) 30° ___________ d) 95° ___________ 3) Utilizando o transferidor, meça e classifique os seguintes ângulos: a) b) Medida: ______________________ Medida: _______________________ Classificação:__________________ Classificação: __________________ c) d) Medida: ______________________ Medida: _______________________ Classificação:__________________ Classificação: __________________ 4) Calcule as medidas desconhecidas dos ângulos das figuras abaixo: a) 2x + 25° b) 4x x – 5° x x = ________________ x = __________________ c) d) x + 15° 48° 3x - 5° x x = _______________________ x = _______________________ 3x + 20°
  • 2. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 8 5) Sendo OC a bissetriz de AÔB, calcule x: A • C • X 60° O B 6 - Observando cada figura, dê a medida x indicada: 7) Na figura abaixo, vamos calcular as medidas X, Y e Z indicadas: 8) Vamos determinar os valores para X e Y indicados na figura abaixo: a) b) 9) Na figura abaixo, OM é a bissetriz do ângulo BOA ^ . Determine a medida x indicada: C
  • 3. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 9 10) Analisando a figura do exercício anterior, determine a medida do ângulo AOC ^ . 11) Vamos calcular, em graus, a medida x indicada nas figuras. 2. Retas Paralelas 12) Na figura abaixo, identifique um par de ângulos: 13) Na figura abaixo, qual o nome dos seguintes pares de ângulos: 14)
  • 4. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 10 15) Nas figuras abaixo, determine o valor de x sabendo que r // s. 16) Nas figuras abaixo, determine o valor de a, sendo r // s: 17) Duas retas paralelas cortadas por uma transversal formam dois ângulos correspondentes representados, em graus, por 5x + 20º e 2x + 50º. Determine o valor de x: 18) Duas retas paralelas cortadas por uma transversal formam ângulos colaterais internos expressos em graus por 3x -50º e 2x -10º. Determine as medidas desses ângulos. 3. Produtos Notáveis 19) Complete a tabela: a b (a + b)2 a2 + b2 5 3 0 6 3 - 1 - 1 4
  • 5. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 11 O que você observou? ________________________________________________________________________ 20) Calcule: a) (x + 7)² = _________________________________________________________________________________ b) (5 + 2m)² = _______________________________________________________________________________ c) (3n + 2m)² = ______________________________________________________________________________ d) (7 + x)² = _________________________________________________________________________________ e) (5x2 + 1)2 = _______________________________________________________________________________ f) (2bc + a)² = _______________________________________________________________________________ g) (x + 0,5)2 = _______________________________________________________________________________ h) (u + ½)2 = ________________________________________________________________________________ i) (2 – x³)² = ________________________________________________________________________________ j) (4t – 3u)² = _______________________________________________________________________________ l) (n – 6)² = ________________________________________________________________________________ m) (5x – 2y)² = ______________________________________________________________________________ n) (xy – 10)2 = _______________________________________________________________________________ o) (t – 0,2)2 = ________________________________________________________________________________ p) (x + 9) (x – 9) = ___________________________________________________________________________ q) (3x + 5) (3x – 5) = _________________________________________________________________________ r) (m2 – 6) (m2 + 6) = _________________________________________________________________________ s) (2a + 5) (2a – 5) = __________________________________________________________________________ t) (w³ – 2) (w³ + 2) = _________________________________________________________________________ u) (4m + 3n) (4m + 3n) = ______________________________________________________________________ v) (0,3 – a) (0,3 + a) = ________________________________________________________________________ x) (x + ) (x – ) = __________________________________________________________________________ 21) Simplifique as expressões: a) (x + 1)² + (x + 2)² – (2x +1) = ________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ b) (2x + 1)2 + (3x + 1)2 = ______________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ c) (x + 5)2 – x(x + 3) = _________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ d) (t – 4)2 – (x – 1)2 = __________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________
  • 6. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 12 e) (x + 1)2 – (x – 2)2 = _________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ f) ½[(x + 1)2 + (x – 1)2 ] = ______________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ g) (m – 1)2 – (m + 1)(m – 1) = ___________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ h) (x + 4)(x – 4) – (x – 4)2 = _____________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ 22) (2a – 5b)² é o mesmo que: a) 4a² – 20a²b² + 25b² b) 4a² + 20ab – 25b² c) 4a² + 20ab + 25b² d) 4a² – 20ab – 25b² e) 4a² – 20ab + 25b² Resolução: __________________________________________________________________________________ 23) A expressão (2n+1)² + (n+2)² + 2(n+1) (n-1) é igual a: a) 7n² + 6n + 3 b) 7n² + 6n – 3 c) 7n² + 6n + 4 d) 7n² + 8n + 4 e) 7n² + 8n + 3 Resolução: __________________________________________________________________________________ ___________________________________________________________________________________________ 4. Fatoração 24) Fatore as expressões: a) 7q2 – 28 = _______________________________ b) 33x + 22y – 55z = ______________________________ c) x6 + x7 + x8 = ____________________________ d) 36 cd + 6 cd2 = _________________________________ e) x(a + b) + y(a + b) = ______________________ f) 2a(x – 1) – b(x – 1) = ____________________________ g) 7a – 7c + ma – mc = _______________________ h) a3 + 3a2 + 2a + 6 = ______________________________ i) x3 – x2 + 5x – 5 = __________________________ j) x2 – 36 = _______________________________________ l) 25 – a2 = _________________________________ m) 9x2 – 16 = _____________________________________ n) 9x2 – 16 = _______________________________ o) 1 – 81a2 = _____________________________________ p) 100 – π2 = ______________________________ q) 36x4 – y6 = _____________________________________ r) x2 + 2x + 1 = ______________________________ s) x2 – 2x + 1 = ___________________________________ t) 1 – 6m + 9m2 = ___________________________ u) x2 + 12x + 36 = _________________________________ v) 36a2 – 12ac + c2 = _________________________ x) y4 + 4y2 + 4 = __________________________________ 25) Agrupe os termos e fatore: a) 5x + ax + 5y + ay = _________________________________________________________________________ b) x3 + 2x2 + 7x + 14 = ________________________________________________________________________ c) c2 – c + cx – x = ____________________________________________________________________________ d) ax + bx + ay + by + az + bz = ________________________________________________________________
  • 7. Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre 13 26) Relacione as expressões equivalentes: A) x(x + 5) ( ) 20x + 4 B) 5x + 10 ( ) 5(3x + 4) C) x + 5x2 ( ) x2 + 5x D) 4(1 + 5x) ( ) 5(2 + x) E) 15x + 20 ( ) x(1 + 5x) BOM ESTUDO! Profª Renata Lorenzo Anotações... ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________