(-1000又2/3) (-999又5/6) 2000又3/4 (-1又1/2)用拆项法做

(-1000又2/3) (-999又5/6) 2000又3/4 (-1又1/2)
=-1000-2/3-999-5/6 2000 3/4-1-1/2
=-2-5/6 3/4
=-2又1/12

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