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(123456789的平方-1234567890*1234567892)分之123456789 求简算方法和结果
有没有 简单点的求你们了
人气:370 ℃ 时间:2020-02-06 00:14:34
解答
令123456799=a
则原式=a/[a²-(a+1)(a+3)]
=a/(a²-a²-4a-3)
=-a/(4a+3)
=-123456789/493827159分子是123456789 不是1234567899
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