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9999*9999怎么简便运算
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人气:460 ℃ 时间:2020-02-06 01:16:59
解答
9999 = 10000 -1
故:9999*9999 = (10000 -1) * (10000 -1)
= 100000000 - 20000 +1
= 99980001
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