若方程
的三个实根可分别作为一椭圆、一双曲线、一抛物线的离心率,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac603c0b3d1d7fd42bd50222b6ab94d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342b40e2068ffb92320b6a9102a7299e.png)
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更新时间:2018-02-08 17:39:25
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相似题推荐
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(0.4)
名校
【推荐1】已知奇函数
满足
,则代数式
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4f0a85e88d92ee17bd346bd059afc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e72b6cd8f402df6f7ecd54b4bfd155e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88953eb84af3488f02f55420ac9ef45c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】已知点
与点
在直线
的两侧,给出下列命题:
①
;
②当
时,
有最小值,无最大值;
③存在正实数
,使得
恒成立;
④当
且
,
时,
的取值范围是
.
其中正确的命题是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bec550c01b4f075f22ab67f5e55ed5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451fc6e4248b63e70595f23842f06c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962b58f6e56b0bdd3d356b016a16760b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3752973b200fdb1acd9549b9950c9476.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
③存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a8ba4c08c0cbaaecde5d13f7c7d0d2.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbac6c9561350ac84cd903500fcf82d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456ba62cab8a35d85656f8604c8ca701.png)
其中正确的命题是( )
A.①② | B.②③ | C.②④ | D.③④ |
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【推荐1】已知椭圆
的左、右顶点分别为A,B,C为上顶点,P是椭圆上一点,
,椭圆的离心率
,则直线
斜率的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb223b8777ab973970491bf0dcc6806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da50c86d62316211af1ac45a68e6aeb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac292fb716d548ba133899e0964fe0a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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【推荐2】已知椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
的左、右焦点分别为
,
,点
为椭圆上不同于左、右顶点的任意一点,
为
的内心,且
,若椭圆的离心率为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434249d6640b0c1a712d215cf8b83d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9df1061c3ba5151ba2f7359acaf356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ce5f8dcc9be183875323c53b0dfc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
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【推荐3】已知椭圆
的左、右焦点分别为
,离心率为
,点P在椭圆C上,直线
与直线
交于点Q,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cc81cfaccc00aa4b7139de5a35a102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84b84d04d6b0328d1dbb890150f0073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983f43cbde7233a6525bd8406fdd1835.png)
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【推荐1】已知双曲线
的左右焦点为
,过左焦点
作垂直于
轴的直线交双曲线的两条渐近线
两点,若
是钝角,则双曲线离心率的范围是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab820a43016677dcc071517b4735f52.png)
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【推荐2】设
为椭圆
与双曲线
的公共的左右焦点,它们在第一象限内 交于点
,
是以线段
为底边的等腰三角形.若双曲线
的离心率
,则椭圆
的离心率取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd486b8796b3454eab219c28ed131683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42fc33bcfc63ec2f4940ccd3f862400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b67528f875a6d4bac8bbf784f7b66a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a3a2ba62f3a81c796daacf9b6ba561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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