已知两个点M(-5,0)和N(5,0),若直线上存在点P,使|PM|-|PN|=6,则称该直线为“B型直线”,给出下列直线:①y=x+1; ②
;③y=2;④y=2x+1.
其中为“B型直线”的是______ .(填上所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ac1756e6cc3266bd7198a024f871af.png)
其中为“B型直线”的是
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更新时间:2016-11-30 11:54:52
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【知识点】 讨论双曲线与直线的位置关系
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【推荐1】若点
到直线
的距离小于
,则在下列曲线中:①
;②
;③
;④
;与直线
一定有公共点的曲线的序号是_________ .(写出你认为正确的所有序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f46bd6985253f993dc2d1c12b801dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb4717d7fa6d522090c5e949f650bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c477e5ade921ffa8377c4719319380ff.png)
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【推荐2】已知动点
在双曲线
上,双曲线
的左、右焦点分别为
,
,下列结论正确的是________ .
①双曲线
的渐近线与圆
相切
②满足
的点
共有
个
③直线
与双曲线的两支各有一个交点的充要条件是
④若
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b30352c43707c4e54b94ce5b61f2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
①双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44fb58b3828f7f9a67032a7b1f052ad8.png)
②满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31251fac8146ae3e9d6611a5e54899c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018d29fbd23afb4c465c9c5c8fd42eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aca4b67db593faef9a79b1d0561913e.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b5a2d6c1edf7798c4ac7983404bafe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99ce280464c01dc7ff386c5b92bd1eb.png)
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