73乘162减61乘73减73的简便算法

问题描述:

73乘162减61乘73减73的简便算法

73*162-61*73-73
=73*(162-61-1)
=73*100
=7300

73*162-61*73-73
=73*162-61*73-73*1
=73*(162-61-1)
=73*[162-(61+1)]
=73*(162-62)
=73*100
=7300