3又2/5-3又1/5x1/4+1又3/5 咋简算

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3又2/5-3又1/5x1/4+1又3/5 咋简算
3又2/5-3又1/5x1/4+1又3/5 咋简算

3又2/5-3又1/5x1/4+1又3/5 咋简算
3又2/5-3又1/5x1/4+1又3/5
=(3又2/5+1又3/5)-16/5x1/4
=5-4/5
=4.2

3又2/5-3又1/5x1/4+1又3/5 =17/5-16/5x1/4+8/5=（17-4+8）/5=21/5 =4.2