23乘22分之21(用两种方法计算,简便计算)

分类: 作业答案 • 2021-12-19 17:51:47

问题描述：

答

23*21/22
=(22+1)*21/22
=22*21/22+1*21/22
=21+21/22
=21又21/22

23*21/22
=23*(1-1/22)
=23*1-23*1/22
=23-1又1/22
=21又21/22