7.32×4.8+0.52×73.2=73.2×0.48+0.52×73.2=73.2×(0.48+0.52)=79.3×1=79.2
=7.32*4.8+7-32*5.2=7.32*(4.8+5.2)=7.32*10=73.2
（4.8+5.2）×7.32
拿计算器
