6.3x2.3+7.7x2.1x3用简便方法算

问题描述:

6.3x2.3+7.7x2.1x3用简便方法算

6.3x2.3+7.7x2.1x3
=6.3*2.3+7.7*6.3
=6.3*(2.3+7.7)
=6.3*10
=63