1 . 在直角坐标系中,直线l过点
,且倾斜角为
,
以直角坐标系的原点O为极点,x轴的正半轴为极轴建立极坐标系,曲线C的极坐标方程为
.
求直线l的参数方程和曲线C的直角坐标方程,并判断曲线C是什么曲线;
设直线l与曲线C相交与M,N两点,当
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b1b1024df5806a30b7e1bcf82f0f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5f34b10d967e60049f39c02e7b0e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a14cbe257e082a9d851f7691b4ba792e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b67c213e1fd0b2cf9518a4b2b7ab7202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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2018-04-25更新
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7卷引用:湖南省永州市2018届高三下学期第三次模拟考试数学(文)试题