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1+(-2)+3+(-4)省略号+2001+(-2002)怎么做
1+(-2)+3+(-4)省略号+2001+(-2002)怎么做
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2020-04-24 20:00
1+(-2)+3+(-4)省略号+2001+(-2002)怎么做
1+(-2)+3+(-4)省略号+2001+(-2002)怎么做
1+(-2)+3+(-4)+...+2001+(-2002)
=[1+(-2)]+[3+(-4)]+...+[2001+(-2002]
=(-1)+(-1)+(-1)+...+(-1)+(-1),[共2002/2=1001个(-1)]
=1001*(-1)
=-1001