函数f(x)=xex-ln x-ax.
(1)若函数f(x)在点(1,f(1))处的切线与直线y=2(e-1)(x-1)平行,求实数a的值.
(2)若函数f(x)在[1,+∞)上递增,求实数a的取值范围.
(1)若函数f(x)在点(1,f(1))处的切线与直线y=2(e-1)(x-1)平行,求实数a的值.
(2)若函数f(x)在[1,+∞)上递增,求实数a的取值范围.
更新时间:2021-03-23 10:51:21
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【推荐1】设函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d3c9b0d99ccf9bf448cb28c7214d8a.png)
(1)若
,求
在![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105835ef2db90df2f3b32d39ba243905.png)
上的最大值
;
(2)若
在区间[1,2]上为减函数,求a的取值范围;
(3)若直线
为函数
的图象的一条切线,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d3c9b0d99ccf9bf448cb28c7214d8a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105835ef2db90df2f3b32d39ba243905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bcaceadc00d891e292c8bdff9e4ce64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6552c3a42c2629ef9533f0fc651736.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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解题方法
【推荐2】已知函数
在点
处的切线方程为
.
(1)求实数
的值;
(2)若存在
,满足
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134e3cd139113b06188d2ef4b7427d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ffeb2e82278491407c85dc15eb7df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fdae9d755b3860dda8d23214ddff92.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccde0cda4af782cd3338dac5d9762ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c32f6ab9cde7cd4800271b46678e20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】如图(甲),在直角梯形ABED中,AB//DE,AB
BE,AB
CD,且BC=CD,AB=2,F、H、G分别为AC ,AD ,DE的中点,现将△ACD沿CD折起,使平面ACD
平面CBED,如图(乙).
(1)求证:平面FHG//平面ABE;
(2)记![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df28ff9b0e9bab03216b3c3d0d96516.png)
表示三棱锥B-ACE 的体积,求
的最大值;
(3)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(1)求证:平面FHG//平面ABE;
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df28ff9b0e9bab03216b3c3d0d96516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014bde89c2e67acf72df101609d5ba17.png)
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(3)当
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解题方法
【推荐2】已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3b6c56aee4bb8a8131fd960415c745.png)
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(2)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc906b12f576e3ffc5e74d3d50c2bbac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5958f044ad2968f1b3d26d2b20b49b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】已知函数
的图像记为曲线
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(1)过点A(2,0)作曲线
的切线,若这样的切线有三条,求
的取值范围;
(2)若
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恒成立,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518085291414deb61dfba8a4e29012d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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