用乘法分配律计算.(125-40)乘8 57乘4+43乘4 27乘99+27

问题描述:

用乘法分配律计算.(125-40)乘8 57乘4+43乘4 27乘99+27

(125-40)乘8
=125*8-40*8
=1000-320
=680
57乘4+43乘4
=4*(57+43)
=4*100
=400
27乘99+27
=27*(99+1)
=27*100
=2700