8.625*2.5+1.375*2.5-2.5*2简便运算
问题描述:
8.625*2.5+1.375*2.5-2.5*2简便运算
答
(8.625+1.375-2)*2.5=8*2.5=20
答
8.625*2.5+1.375*2.5-2.5*2
=2.5*(8.625+1.375-2)
=2.5*8
=20