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求最值的经典题，变形和配凑很关键，高手用权方和不等式求解！
求最值的经典题，用权方和不等式求最小值！
经典求最值题27/448
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App04:58
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App08:27
App05:23
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App04:46
App04:56
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App04:17
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App03:56
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App04:42
App05:45
