你好

[ 4-（4又3/5-3又1/3）]÷15/4
=[ 4-（1+3/5-1/3）]÷15/4
=[3-3/5+1/3）]÷15/4
=[2又2/5+1/3）]÷15/4
=2又11/15÷15/4
=41/15×4/15
=164/225

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