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的简便运算必须是简便的呐~
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

6.19*2.05+79.5*0.619
=6.19*2.05+7..5*10*0.619
=6.19x(2.05+7.95)
=6.19x10
=61.9