计算 1+(-3)+5+(-7)+9+(-11)+...+2001+(-2003)+2005
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![计算 1+(-3)+5+(-7)+9+(-11)+...+2001+(-2003)+2005](/uploads/image/z/1090892-20-2.jpg?t=%E8%AE%A1%E7%AE%97+1%2B%28-3%29%2B5%2B%28-7%29%2B9%2B%28-11%29%2B...%2B2001%2B%28-2003%29%2B2005)
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