(125-9)*8的简便算法(125-9)*8=(125*9)-(125*8)=1125-1000=125

问题描述:

(125-9)*8的简便算法
(125-9)*8
=(125*9)-(125*8)
=1125-1000
=125

不对,应该是:
(125-9)×8…………… 根据乘法分配律
=125×8-9×8
=1000-72
=928

肯定不对呀!
(125-9)*8
=125*8-9*8
=928

不对,应该是
(125-9)*8
=125*8-9*8
=1000-72
=928
简便方法
(125-9)*8
=116*8
=928