23乘22分之21(用两种方法计算,简便计算)
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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
=(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
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