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(-2000又5/6)+(-1999又2/3)-(4000又3/4)-(+1又1/2) =-2000-1999-4000-1-5/6-2/3-3/4-1/2 =-8000-3/2-1/2-3/4 =-8000-2-3/4 =-8002又3/4
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