1+2+3+...+2009+(-1)+(-2)+(-3)+...+(-2009)等于多少,请写出具体步骤
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![1+2+3+...+2009+(-1)+(-2)+(-3)+...+(-2009)等于多少,请写出具体步骤](/uploads/image/z/14577724-28-4.jpg?t=1%2B2%2B3%2B...%2B2009%2B%28-1%29%2B%28-2%29%2B%28-3%29%2B...%2B%28-2009%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%2C%E8%AF%B7%E5%86%99%E5%87%BA%E5%85%B7%E4%BD%93%E6%AD%A5%E9%AA%A4)
1+2+3+...+2009+(-1)+(-2)+(-3)+...+(-2009)等于多少,请写出具体步骤
1+2+3+...+2009+(-1)+(-2)+(-3)+...+(-2009)等于多少,请写出具体步骤
1+2+3+...+2009+(-1)+(-2)+(-3)+...+(-2009)等于多少,请写出具体步骤
1+2+3+...+2009+(-1)+(-2)+(-3)+...+(-2009)
=1+(-1)+2+(-2)=3+(-3)+……+2009+(-2009)
=1-1+2-2+3-3+……+2009-2009
=0
0~1+(-1)=0,依次类推,给分吧
0