1.25×0.84×80-80 简算
问题描述：
1.25×0.84×80-80 简算
答
(1.25X0.84-1)X80
答
1.25×0.84×80-80
=10*0.125*0.84*80-80
=1/8*10*0.84*80-80
=84-80
=4