6.8*2.7+7.3*6.8=6.8*(2.7+7.3)=6.8*10=68通过乘法分配律进行简便计算
=6.8×(2.7+7.3)=6.8×10=68
=6.8×(2.7+7.3)=68
6.8×2.7+7.3×6.8=6.8×(2.7+7.3)=6.8×10=68