已知 x+2y-3=0 求 x² + y² - 4y 的最小值 怎么求？
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shadowking Nov 19, 2022
-1/5 ?
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liuhouer OP @shadowking 不对呀老哥
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Rang666 Nov 20, 2022 via iPhone
x=3-2y 啊，代入进去初中生都能做...
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