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数学
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一道简便计算题 99²+101²-2
人气:476 ℃ 时间:2020-01-30 06:26:03
解答
99²+101²-2
=(99²-1)+(101²-1)
=(99+1)(99-1)+(101+1)(101-1)
=100x98+102x100
=200x100
=20000
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