Question

怎么用巧算做141÷13-102÷13？

这道题怎么做？

Answer 1

变成乘以1/13
然后利用乘法结合律
等于1/13×（141-102）
等于1/13×39
等于3。

Answer 2

141÷13－102÷13
=（141-102）÷13
=39÷13
=3

Answer 3

141÷13-102÷13
=（141-102）÷13
=39÷13
=3

Answer 4

141÷13-102÷13
＝（141-102）÷13
＝39÷13
＝3

Answer 5

141÷13-102÷13
= (141-102) ÷ 13
= [ (140+1) - (100+2) ] ÷ 13
= [ (140-100) + (1-2) ] ÷ 13
= (40-1) ÷ 13
= 39 ÷ 13
= 3