给出定义在
上的两个函数
,
,且
在
处取最值
(1)求
的值;
(2)若函数
在区间
上单调递减,求实数
的取值范围;
(3)试确定函数
的零点个数,并说明理由.
![](https://img.xkw.com/dksih/QBM/2016/10/31/1573102292844544/1573102298562560/STEM/729ba9f983d244749f7439d8d8a99a0b.png?resizew=47)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9de5dfd4d956751485330e9ef699e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8e8ad8d1fc90e8847888a3a08b41dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://img.xkw.com/dksih/QBM/2016/10/31/1573102292844544/1573102298562560/STEM/9bff3cb76a7a4fdbb612b2a8602aba97.png?resizew=35)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cc6494f2c8c4d1bb275da8fa0dcc5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0109d06b8be2e402b5ffbb0aeb501009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)试确定函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d094e5f918ab2bec3070b1d797cfb598.png)
更新时间:2016-12-04 23:07:43
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】已知函数
,
.
(1)若
,
,求函数
的单调区间;
(2)不等式
对于
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2150b0c0926d641eefb3a84716190eb4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d05ca47cd2ea22526826687515486b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
(2)不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d0b5b06108cebf4f7cad886c84dc81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
解题方法
【推荐2】已知函数f(x)=xex,g(x)=a(lnx+x).
(1)当a=e时,求证:f(x)≥g(x)恒成立;
(2)当a>0时,求证:f(x)≤g(x)+1恒有解.
(1)当a=e时,求证:f(x)≥g(x)恒成立;
(2)当a>0时,求证:f(x)≤g(x)+1恒有解.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知函数
.
(1)证明:
;
(2)若函数
在
上有零点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577b3373bdf4b82bbefcc37e4a0c8819.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f805f4f6210ece98ba2a62da228e7cb.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34194ee717081042e0d7380e41a422b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f909328384f9c52134243753d9c954ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】设函数
,
.
(1)设l是
图象的一条切线,求证:当
时,l与坐标轴围成的三角形的面积为定值;
(2)当
时,求函数
零点的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc02f4cbf96f40b7cca5a65e3fab4277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)设l是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐3】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feefa53078f4443a5ea4fe196c2eedcc.png)
(1)当
时,求曲线
在
处的切线方程;
(2)若
在区间
,
各恰有一个零点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feefa53078f4443a5ea4fe196c2eedcc.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9f8845aa2b51c460f2d798c9f62fa3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/359824a93f9adae4d5edfe706e129e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01dc2d99655cf7598837cb0886166ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次