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[函数] 2022 高考数学压轴题, \(f(x)=e^x-a x; \quad g(x)=ax-lnx\)

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TSC999 posted 2022-6-13 12:39 |Read mode
2022 高考数学压轴题:

已知 \(f(x)=e^x-a x;  \quad g(x)=ax-lnx\)

有相同的最小值。

    ①  求 \(a\) ;

    ②  证明:存在直线 \(y=b\),它与 \(f(x)\) 和 \(g(x)\)

有三个交点,它们的横坐标成等差数列。

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original poster TSC999 posted 2022-6-13 13:41
压轴题.png

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original poster TSC999 posted 2022-6-13 13:44
以上证明是根据【西瓜视频】火星课堂老师的讲解所做整理。期待网友给出更简单的方法。

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战巡 posted 2022-6-13 15:03

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