Maths

1. 先乘除後加減
3 x 2 = 3 + 3
= (1 + 1 + 1) + (1 + 1 + 1)
4 x 3 = 4 + 4 + 4
=(1+1+1+1)+(1+1+1+1)+(1+1+1+1)
算式還原

2. 先乘除後加減
3 x 2 + 2= 3 + 3 + 2
= (1 + 1 + 1) + (1 + 1 + 1) + 2
= (1 + 1 + 1) + (1 + 1 + 1) + (1 + 1)
= 8
3 x 2 + 2 = 3 x 4
= (1+1+1)+(1+1+1)+(1+1+1)+(1+1+1)
= 12
算式還原