1-2+3-4+5-6+……+1999-2000=(1-2)+(3-4)+(5-6)+……+(1999-2000)=-1+(-1)+(-1)+(-1)····=(-1)×1000==-1000希望帮到你!
(-2000 5/6)+(-1999 2/3)-(-4000 3-4)-(1 1/2)
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