简便运算:9.8*62.5*1.25-12.5*0.625*18
问题描述:
简便运算:9.8*62.5*1.25-12.5*0.625*18
答
9.8*62.5*1.25-12.5*0.625*18
=9.8*62.5*1.25-1.25*62.5*1.8
=62.5*1.25*(9.8-1.8)
=62.5*1.25*8
=62.5*10
=625