87乘以86之3用简便运算怎么算
问题描述:
87乘以86之3用简便运算怎么算
答
87*3/86
=(86+1)*3/86
=3+3/86
=3又3/86
答
87×3/86=(86+1)×3/86
=86×3/86+1×3/86
=3+3/86
=3又3/86