已知函数
.
(1)求函数
在
处的切线方程;
(2)若对任意的
,
恒成立,求a的取值范围;
(3)当a=3时,设函数
,证明:对于任意的k<1,函数
有且只有一个零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40ba3922028f1d31820a5acd53c1396.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(2)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e82c4003d20b36777f7aea584e3dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cec02721b2487300eb08db6bd2fbe54.png)
(3)当a=3时,设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6b28c29a9e823cf1d6c764323d7e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
2019·天津·三模 查看更多[5]
2019届天津市滨海新区高三高考模拟(5月份)数学(文) 试题四川省成都市第七中学2022届高三下学期三诊模拟考试数学(文)试题四川省盐亭中学2021-2022学年高二下学期第四学月教学质量测试数学(理)试题(已下线)2022年高考天津数学高考真题变式题13-15题(已下线)2022年高考天津数学高考真题变式题19-20题
更新时间:2022-04-28 15:13:32
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解答题-问答题
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【推荐1】已知函数
.
(1)求曲线
在点
处的切线方程;
(2)若0是函数
的极小值点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e175f7deb0fe685780f6ea723fbd053c.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9f8845aa2b51c460f2d798c9f62fa3.png)
(2)若0是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5af7cb1d3d051614696cd4761b3f559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559447f0f9d01acba3d220d9b6b90383.png)
(1)当
时,求
在
处的切线方程.
(2)设
分别为
的极大值点和极小值点,记
,
;
①证明:直线
与曲线
交于另一个点C;
②在①的条件下,判断是否存在常数
,使得
,若存在,求n;若不存在,说明理由.
附:
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/559447f0f9d01acba3d220d9b6b90383.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6470c6a4349ea591ce2bbcd93199f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d14d55cbbfe1f2b82c41efcae8efad1.png)
①证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
②在①的条件下,判断是否存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0723ba7f3a8721cb1381d5be9dc12447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357924c44549675683398a0b7c9bcb26.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b7cfcc147916ae7eeb5d557fea945e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d90807e6a0085068ae47a101b7c87d6.png)
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【推荐3】已知函数
.
(1)求
在
处的切线方程;
(2)若
对任意
恒成立,求正实数
的取值集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4779ce7a8c7f926d6ff221cddb0f9b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f625505c7215e99cdd34275dda0fc12.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d355a7749dd628184dc05fad0e6f26f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aedc1c8a16e306bcd6e5154f9ed6dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
【推荐1】如图所示,已知抛物线E:
与圆M:
(
)相交于A、B、C、D四点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/9cf13be5-5c22-4180-a64c-cdfe7362b0a5.png?resizew=172)
(1)求r的取值范围;
(2)当四边形
的面积最大时,求对角线
、
的交点T的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ad7c068b9b7c0fd764cf7746407079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07a27fa5f04b9bae579a26f4b2193d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ba6b6aa6c3f9faba6b03bc193a6e61.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/9cf13be5-5c22-4180-a64c-cdfe7362b0a5.png?resizew=172)
(1)求r的取值范围;
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】设非负实数
满足
.,求
的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb2ef7c075d2f87cdaa35a726393c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b998f3304f80de45db0f95db691c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecce96ed3d1d7dbb7371d46b922df65d.png)
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【推荐3】已知
,
.
(1)求函数
的最大值;
(2)
,是否存在实数
使得
恒成立?若存在,求出实数
的取值范围;若不存在,请说明理由;
(3)已知函数
有两个不同的极值点
,
,若不等式
恒成立,则求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681d6d27b23b1c41834d7516122f73f9.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbac7357513afd7cd11ecb82d3ec3f0.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d99ed431f61eddb4e2e05dc4a25eef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cd4660f303a4694716ce8f6d50dc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422b61a94a5551d63cf8899b821434a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d25f6b7c406662f02b3995a5e35acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐1】已知函数
,
.
(1)若
,曲线
在点
处的切线与
轴垂直,求
的值;
(2)在(1)的条件下,求证:
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/70f68f91798c43d7858fa47f5012af82.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/b393559de7e143c7b835f151eaeb9945.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/56ffb4e01b224b73bddf91b974be1522.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/3f561a150ded4660867cef14fe3e8142.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/39c81b1236314332989740f3e04fd33d.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/75a3d321112146ad94e96244fbfd08f0.png)
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/8b6fc4a174d34153bf9ff4b5445837d1.png)
(2)在(1)的条件下,求证:
![](https://img.xkw.com/dksih/QBM/2015/12/1/1572332508143616/1572332514263040/STEM/db39966aa2884ae89d6a6dc051f274f8.png)
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【推荐2】已知函数
(a,b为常数),
(1)当
时,求函数
的单调区间;
(2)在(1)的条件下,
有两个不相等的实根,求b的取值范围;
(3)若对任意的
,不等式
在
上恒成立,求b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925585bc32d71b43073b3c5b3b99fa2d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be55c8f2760d6db125f46691a3de48.png)
(2)在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf22c3355e905e9df956d8279a8d7c7.png)
(3)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0412ca6bd9ca2033cc00ea3ddbae85c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9cbbaebb22465c294088726d1d0d2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ead3fdcb8fe8f5eb3dbe7d96cabc28b.png)
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【推荐3】已知函数
为自然对数的底数.
(1)设
,求
在区间
内的实根个数;
(2)若对任意
都成立,求
的取值范围;
(3)设
,比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4ac8de532d79b884ad0d52fc81c809.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd57ea26ad54a7381754ade671ef1ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01dc2d99655cf7598837cb0886166ed.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f310a25de666fdf33f3c0ea9cb7616bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8125c5364e88f8a7d115bd46930f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】已知函数
,且点
在函数
的图像上,记
,其中
是自然对数的底数,
,
(1)求实数
的值并求函数
的极值;
(2)当
时,证明:函数
有两个零点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3980cac424aa7c58ddaee025c56018a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4c8c1a5aeff2b266cbc6948383216c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f277e152e38d860d5803186d3e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867a01569cb3a5ab9587c85eeb43fb23.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544f91d4fb22c571db9f8481b72a0419.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9673aa5de077a0a06788c21b914165d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544f91d4fb22c571db9f8481b72a0419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca579894dad67bc82cb715fd48e0d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a141610904bc6bdb66b1cea59fcdcb20.png)
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【推荐2】已知
.
(1)讨论函数
的单调性.
(2)函数
在
上是否存在两个零点?若存在,求出实数
的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f958ac673f545a8f448108d7ce7233.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e1c9c97de9198d47306216e9961b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】设函数
.
(1)求
的最小值;
(2)设
,证明:
有唯一极小值点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9e95b0c6ec5578195947c33ceb8b39.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439212ef55ac57fb96a77baebdfba387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483b9a8dbe62c69d58d2c009bd37c0c7.png)
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