[理工] 张凡计组上P.513

楼主: frank4133 (HYF)   2022-12-05 23:45:31
https://imgur.com/a/leHEBvt
https://imgur.com/a/Ad3Muhf
想请问关于第四题的解答是怎么推导出来的?
再麻烦高手路过有空帮忙解惑了~ 感谢!

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