(4/5+1/3)+(1-1/5+2/3)的简便算法暂时没钱,

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(4/5+1/3)+(1-1/5+2/3)的简便算法暂时没钱,
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(4/5+1/3)+(1-1/5+2/3)的简便算法暂时没钱,
(4/5+1/3)+(1-1/5+2/3)的简便算法
暂时没钱,

(4/5+1/3)+(1-1/5+2/3)的简便算法暂时没钱,
(4/5+1/3)+(1-1/5+2/3)
=4/5-1/5+1/3+2/3
=3/5+1
=1又3/5