已知
,
.
(1)当
时,
为增函数,求实数
的取值范围;
(2)设函数
,若不等式
对
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b667db3e1a239e2dce88689898f9a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3e0c1b288d8cc073a1c80d16722529.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbb01a7f5e9861aa185c6c63fcd58c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3c2be7482719651bcf491949681e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5937511c3c177a6722e7004ab4d897e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d2458760f26f868ea1dadb5814594b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ff33c61648237bd4076d6a7168c9d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2017-05-18 00:31:36
|
相似题推荐
解答题-证明题
|
困难
(0.15)
解题方法
【推荐1】已知函数
,其中
,
,
为自然对数的底数.
若
,
,①若函数
单调递增,求实数
的取值范围;②若对任意
,
恒成立,求实数
的取值范围.
若
,且
存在两个极值点
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51aa0377178a5dbb39aad485c5dbea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b916c6d3fb2fdc67421489f207c93903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81ed7f6a4475e0fa682fa81ee747da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.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/1ff8d81b33375f68ddc6c41e42aca315.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐2】已知函数
.
(1)若函数
为增函数,求实数
的取值范围;
(2)设
有两个不同零点
,
.
(i)证明:
;
(ii)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6894e39d6567a6f9d3aaa653da65a551.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c24d5d082f51c93bd35a423796a742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
(i)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb84b3b33fa3174cfbc6a7802303c2d6.png)
(ii)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a2c06d2c1bd79ce48e65d5b42a3c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae0741d5b68bdb629b48247c5ecb5b7.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】已知函数
(a
R),其中e为自然对数的底数.
(1)若
,求函数
的单调减区间;
(2)若函数
的定义域为R,且
,求a的取值范围;
(3)证明:对任意
,曲线
上有且仅有三个不同的点,在这三点处的切线经过坐标原点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2024a27d85c91efa4dace232c72549b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02d44492b51b0e08208fdc0d1707025.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6922ed9d20c19c11aa47f599cd3b87ba.png)
(3)证明:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80fff7c8c260edb3ce51f15f8d617633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
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【推荐1】如图,直线
交抛物线
于
、
两点,
.
、
是位于
轴和直线
之间的抛物线
上两点,连接
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/4b1332b7-6255-46fb-aad2-994baf917b3a.png?resizew=170)
(1)求抛物线
的标准方程;
(2)求四边形
的面积
的最大值,以及
取得最大值时直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03534c7df6560bed49c6f10ff7a829a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e8f72c51b889287eb272c8fef07504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07aaaca2e19aa71c3f99875f46642347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/4b1332b7-6255-46fb-aad2-994baf917b3a.png?resizew=170)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】设函数
.
(1)已知函数在定义域内为增函数,求a的取值范围;
(2)设
,对于
,总存在
,使
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb9def16a392d4185e0e2a63c5f1438.png)
(1)已知函数在定义域内为增函数,求a的取值范围;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9971300afa72a5be93c985b1e40d8cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7943da8694e7de296ca1d64a90ee0a43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63bb0cb91f7e3f5989927b293a7b7bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e3fd0b394303463b858cad482c14ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐1】已知函数
的两个零点记为
.
(1)求
的取值范围;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb53db808903466ba29e7691ceb3423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd581460d2f1620c20d87fdaf68a4bf.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】已知函数
,
.
(1)分别求函数
与
在区间
上的极值;
(2)求证:对任意
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6337986ffce5fdb7e037780a82c2f08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3554f8e28007f8db46942ce40d649b7c.png)
(1)分别求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a34916bed99ec3aba7382a635364c7.png)
(2)求证:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acda6b6464db27e1ec18a1522406d2.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
名校
【推荐3】已知函数
.
(1)当
时,讨论
的单调递增区间;
(2)若
有两个极值点
,且
,求
取值范围,(其中
为自然对数的底数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d797a2db981447da3e604690da4afca.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb547d20547b0c864837be0a6e9672d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e21ac584efecd770c2dd9d2e83803a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcd143a57a268a5a8ef486e2a4d5c0a.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐1】已知函数
(
是自然对数的底数).
(1)当
时,求曲线
在点
处的切线方程;
(2)当
时,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610532facd31aed131e1a29656eda4c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c3a071e25281dee9a0ef0b75dd550c2.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d983f1213ce474227e80c41d7fba6374.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfb1c8f3a7617bec405d0b13035866d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
解题方法
【推荐2】已知函数
.
(1)当
时,设
,求
的最小值;
(2)若
在
上恒成立,求实数
的取值范围;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7f9b35017daa8b524c5717a355834a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1fcb98dd8fe55e80bc83346f50a023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00af3860214d2716fc957b45ddcf0b8a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e930f015310208c04b1aae6bee3e9d07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3aae9c8988f4a48db69cad3308942c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf92502fe668238e4524ef482a2420c.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】已知函数
,
.
(1)讨论函数
的单调性;
(2)若
在区间
上恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1de8249e3813b22c02bddbee3b2704f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad9463bca9835b17ef002987866a25c3.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447d6f62c09c1d05346fd16a24159f6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0109d06b8be2e402b5ffbb0aeb501009.png)
您最近一年使用:0次