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งานนำเสนอ12
- 21.
PQR
QR, PM = 24 PQ = 25 MR = 10
PQR
- 32.
√ , √ , √ , -√ , - √ , -√ ¶
- 33. a
a a
-
- -
x -
- -
-
- 34. x4 - x -4
x8 - x -8
x35 - x (-35)
- 44. 2x+3 = 0
2a+1 = 0
a, b c
symmetric property)
a=b b=a
transitive property)
a=b b=c a=c
- 47. y = mx + c
m Y c
y = 3x + 2 y = 2x - 5
y=x+7
y=-x-8
- 48. 2.Ax + By + C = 0
x + 2y + 5 = 0
3x - 4y - 12 = 0
8x + 7y - 20 = 0
Ax + By + C = 0
By = - Ax - C
Y=-X-( B
y = mx + c
m=- C=-
- 49. 3. y = c X
X C
Y=2 X
X=2
Y = -5 X
X=5
- 50. 4. X = C Y
Y C|
X=3 Y
Y
X = -4 Y
Y
- 51. X Y X
y=0 y X=0
X Y
a X b Y
X a,0)
Y b)
- 52. X y = 2x - 5 y
x = 3 , y = 2(3) - 5 = 1
y = 2x –
5
Slope)
y = mx + c m
Ax + By + C = 0 -
y = 2x - 3
x - 2y + 5 = 0
- 53. y = 3x - 5
X
x + 4y - 12 = 0
X
X
Y
- 54. Ax + By + C = 0
A,B C A,B
y = mx + c m c
m C
x
- 57. x = x/6 + x/12 + x/7 + 5 + x/2 + 4
...........................x = x/6 + x/12 + x/7 + x/2 + 9
...........................x = (1/6 + 1/12 + 1/7 + 1/2) x + 9
...........................x = [(14 + 7 +12 + 42) /84] x + 9
...........................x = 75/84 x + 9
.....................84 x = 75 x + 756
.......................9 x = 756
...........................x = 84