4.2*0.75+7.52怎样简便运算?
问题描述:
4.2*0.75+7.52怎样简便运算?
答
4.2*0.75+7.52
=(4+0.2)x0.75+7.52
=4x0.75+0.2x0.75+7.52
=3+0.15+7.52
=3.15+7.52
=10.67