86×32+86×87-86×19简便算法怎么做?(急)求简便算法算式86×32+86×87-86×19

问题描述:

86×32+86×87-86×19简便算法怎么做?(急)
求简便算法算式86×32+86×87-86×19

原式 = 86 * ( 32 + 87 - 19 )
= 86 * ( 119 - 19 )
= 86 * 100
= 8600