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1/31×5/2+5/12×4/31+5/9×8/31怎么计算
2个回答
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1/31×5/2+5/12×4/31+5/9×8/31
=5/31×1/2+5/31×4/12+5/31×8/9
=5/31×(1/2+4/12+8/9)
=5/31×31/18
=5/18
=5/31×1/2+5/31×4/12+5/31×8/9
=5/31×(1/2+4/12+8/9)
=5/31×31/18
=5/18
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