1 . 已知直线
与曲线
和
分别相切于点
,
.有以下命题:(1)
(
为原点);(2)
;(3)当
时,
.则真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ec45b0558fc0d3473ca9da21d5c073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bce8006396fd6519f366dc4a7cb8045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0954a8b329893eb0c5b400e3fbc4042f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b86d609bdb16f3fe441794c7140446.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a4e0d114afe36b3ad5eaac27ddee8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0e4f76b0a117ca47e208a5aa991b6a.png)
A.0 | B.1 | C.2 | D.3 |
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2020-10-24更新
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1958次组卷
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5卷引用:河北省唐山市2019-2020学年高三上学期期末数学理科试题