用简便方法计算111x37十9999x7

日期：2021-06-22 16:28:46 人气：1

简便方法计算如下：
111x37+9999x7
=111x(30+7)+(10000-1)x7
=111x30+111x7+10000x7-1x7
=3330+777+70000-7
=70000+3330+(777-7)
=73330+770
=74100