91乘7/90用简便运算
问题描述:
91乘7/90用简便运算
答
91×7/90
=(90+1)×7/90
=90×7/90+7/90
=7又7/90
91乘7/90用简便运算
91×7/90
=(90+1)×7/90
=90×7/90+7/90
=7又7/90