7.8*0.125怎么简算?
问题描述：
7.8*0.125怎么简算?
答
7.8*0.125=(78/10)*(1/8)=39/40
答
7.8*0.125
=(8-0.2)x0.125
=8x0.125-0.2x0.125
=1-0.025
=0.975