若
,
,
,求证:
,
,
不可能同时大于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55feb3cbcaf37c63b6ce1c5abece8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb524c1ed61704756d3af60e00be213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c79aebb58555ad3246f73ac4e84702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c15ed0419f0cc22e0e3b2ae4de2608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad6d4327986efb45fb8e3032542f9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62fc058173e9ace17fd785d820ab564d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31da7291140e430a11e2a10cc6cdefbb.png)
更新时间:2020-03-18 22:26:54
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】若函数
满足:对于其定义域
内的任何一个自变量
,都有函数值
,则称函数
在
上封闭.
(1)若下列函数:
,
的定义域为
,试判断其中哪些在
上封闭,并说明理由.
(2)若函数
的定义域为
,是否存在实数
,使得
在其定义域
上封闭?若存在,求出所有
的值,并给出证明;若不存在,请说明理由.
(3)已知函数
在其定义域
上封闭,且单调递增,若
且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbeb3e409144a9614be9adabf420987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)若下列函数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f26e4241c63908a3d50de4244eca11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a503d329efc27f634f49d87c799ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a416686ed19ea01d2e58efd200a7c131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ede4f08bda3f2125a9e5848ea63bca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3102c0a2f53b80f9dddbf9352537e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374054f44b9a52668f91ac7601e63c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f66a2b3d90f0d935d6c8ebaf675349.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知
的内角
,
,
对应的边分别为
,
,
,三边互不相等,且满足
.
(1)比较
与
的大小,并证明你的结论;
(2)求证:
不可能是钝角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/2cd5a7ec932f12eacb2e8793af166d33.png)
(1)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fe34b1cc3a3cfcfad66fb03b9e22c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c147d6cbd7cbaeb8ec08a0ba69cd59dd.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
您最近一年使用:0次