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计算:
1-3+5-7+9-11+…-1999+2001=______.
人气:287 ℃ 时间:2020-03-26 02:16:10
解答
1-3+5-7+9-11+…-1999+2001
=1+(5-3)+(9-7)+(13-11)+…+(2001-1999);
=1+2×500;
=1001.
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