73乘31加28乘31减31用乘法分配律怎么算

问题描述:

73乘31加28乘31减31用乘法分配律怎么算

(73+28-1)乘31

原式=31乘(73+28-1)=31乘100=3100

73*31 + 28*31 - 31
= 73*31 + 28*31 - 1*31
= 31*(73+28-1)
= 31*100
= 3100

73*31+28*31-31
=31*(73+28)-31
=31*101-31
=31*(100+1)-31
=31*100+31*1-31
=31*100(抵消后面的那个“-31”)
=3100
=3100