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【2又5分之3】+【3又4分之1】+【3又5分之2】+【+2又4分之3】+【-1又2分之1】+【+1又3分之1=(2又3/5+3又2/5)+(3又1/4+2又3/4)+(1又1/3-1又1/2)=6+6-1/6=11又5/6
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