6.3x2.3+7.7x2.1x3用简便方法算?急

问题描述:

6.3x2.3+7.7x2.1x3用简便方法算?急

6.3x2.3+7.7x2.1x3
=6.3x2.3+7.7x6.3
=6.3×(2.3+7.7)
=6.3×10
=63