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数学
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50²—49²+48²—47²+46²—……+2²-1²;
人气:455 ℃ 时间:2020-06-17 16:49:47
解答
50²—49²+48²—47²+46²—……+2²-1²
=(50-49)(50+49)+……+(2-1)(2+1)
=50+49+48+……+2+1
=(50+1)*50/2
=1275
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