已知
,
,
,
.
(1)求
的最大值及相应的
的值;
(2)若以
,
,
为三边长总能构成三角形,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3190dbc36eccc24f94c8819b79b30f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb1fc17f2043831cdb082db95c62add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c92d82f5d39fc172a954d83baa503d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d012d124f04963fb72a68af40d5f8f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c462d08d75fcc7ccf9c3ecea1972e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9277dbbce271b4fa43757e565a9979c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2019-07-15 18:16:41
|
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解答题-证明题
|
较难
(0.4)
名校
【推荐1】已知函数
,且
的解集为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1417a39c99b1e6b489c7c033a0625af.png)
(Ⅰ)求
的值;
(Ⅱ)若
,
,
都是正实数,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc5b08e2a200b89a695c5d768116418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d619ca29fc5425709e42d6f121a5d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1417a39c99b1e6b489c7c033a0625af.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39aba0ffb778c1fdaf3dad3a57ad335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c13349814250ec5c66d7b9387a13ac0.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】[选修4-5:不等式选讲]
已知
,
,
,
求证:(Ⅰ)
;
(Ⅱ)
.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8b020a520a9ba93cc751c175a2903d.png)
求证:(Ⅰ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be74ed666178c7642f73e406603783f6.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08496edc372d910c3c825ab9e2736008.png)
您最近一年使用:0次