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数学
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(22+42+62+……+20002)-(12+32+52……+19992)
人气:190 ℃ 时间:2020-01-08 15:17:21
解答
=22-12+42-32+52-42+……20002-19992=1000×10=10000 备注 从22-20002之间有1000个数
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