6.19*2.05+79.5*0.619的简便运算

问题描述:

6.19*2.05+79.5*0.619的简便运算
必须是简便的呐~

6.19*2.05+79.5*0.619
=6.19×2.05+7.95×6.19
=6.19×(2.05+7.95)
=6.19×10
=61.9