计算: 1+(-3)+5+(-7)+9+(-11)+...+2001+(-2003)+2005等于多少
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计算: 1+(-3)+5+(-7)+9+(-11)+...+2001+(-2003)+2005等于多少
计算: 1+(-3)+5+(-7)+9+(-11)+...+2001+(-2003)+2005等于多少
计算: 1+(-3)+5+(-7)+9+(-11)+...+2001+(-2003)+2005等于多少
原式=(1-3)+(5-7)+(9-11)+.+(2001-2003)+2005
= -(2+2+2.+2-2005)
= -(2*501-2005)
= 1003