在平面直角坐标系xOy中,曲线C的参数方程为
(a或t为参数).以O为极点,x轴的正半轴为极轴建立极坐标系,直线l的极坐标方程为ρ(cosθ
sinθ)=1.
(1)当t为参数,α
时,判断曲线C与直线l的位置关系;
(2)当α为参数,t=2时,直线l与曲线C交于A,B两点,设P(1,0),求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1119495976cc8c0d6fd1f78b0b98f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9935c4088e7b1e4a18439325db38f2d5.png)
(1)当t为参数,α
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b287091fd703e0874cd19b9bdff9fe.png)
(2)当α为参数,t=2时,直线l与曲线C交于A,B两点,设P(1,0),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7384b9afcef2d86a87eee0c66f383052.png)
更新时间:2020-07-02 06:51:03
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【推荐1】选修4-4:坐标系与参数方程
在直角坐标系中
中,曲线
的参数方程为
(
为参数),以原点
为极点,
轴的正半轴为极轴建立极坐标系.
(1)写出曲线
的普通方程和极坐标方程;
(2)若直线
与曲线
相交于点
两点,且
,求证:
为定值,并求出这个定值.
在直角坐标系中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7784de0f941caa07cd130c7b63892e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)写出曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe1d7c64c601c9d8e2423f4ccec30af.png)
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【推荐2】在平面直角坐标系
中,直线
的参数方程为
(其中
为参数)、在以
为极点
轴的非负半轴为极轴的极坐标系(两种坐标系的单位长度相同)中,曲线
的极坐标方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faca9884e1224e9013ca9b36914effab.png)
(1)求直线
的普通方程和曲线
的直角坐标方程;
(2)设点
的直角坐标为
,直线
与曲线
交于
两点,弦
的中点为
是曲线
上异于
的点,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda90866c0f77f796b729a85e6c2761a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faca9884e1224e9013ca9b36914effab.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd0825e68122a65426840fbf07cf296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f2fe27cf0b07474439cdd823f66590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d13e82ad6bdae51f30e2a3dafd630d.png)
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【推荐3】在直角坐标系
中,曲线
的参数方程为
以
为极点,
轴正半轴为极轴建立极坐标系,设点
在曲线
上,点
在曲线
上,且
为正三角形.
(1)求点
,
的极坐标;
(2)若点
为曲线
上的动点,
为线段
的中点,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d630ca64a6ca950d93f770db68bdb0e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e347fd31e336fa2a8e3ac0a8dd5cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39fb92688fa037cd1fb7898080f0b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68a8ac858a8cbe2c771ab8bea1511b5.png)
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【推荐1】在平面直角坐标系xOy中,以O为极点,x轴非负半轴为极轴建立极坐标系,取相同的长度单位,已知曲线C的极坐标方程为ρ=2
sinθ,直线l的参数方程为
(t为参数).
(Ⅰ)写出曲线C的直角坐标方程和直线l的普通方程.
(Ⅱ)若P(3,
),直线l与曲线C相交于M,N两点,求|PM|+|PN|的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc86116e589b4171c6985843337b1181.png)
(Ⅰ)写出曲线C的直角坐标方程和直线l的普通方程.
(Ⅱ)若P(3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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【推荐2】在平面直角坐标系
中,曲线
(
为参数,
),以坐标原点
为极点,
轴的正半轴为极轴建立极坐标系,点
在曲线
上.
(1)求曲线
的极坐标方程;
(2)射线
与曲线
交于
,
两点,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2d747a89d7dc8a3a0a6cbffa5c1bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bbfe7ba8956de33c90b38de0f510ea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97557c1a92650fdb0182966f60befa85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c92080d8e85904be296053d48342841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/aea72b568f928439200d49423d1fa3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd723551cd497633d77e7498eed46ad.png)
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【推荐1】已知点
,
,曲线
:
,设动点
满足:
.
(1)求动点
的轨迹
的普通方程;
(2)若
与曲线
相交于A,B两点,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a98415777a67affe8c743dbe535b7d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079e8009a253728d9aca00191b1781a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea91e78c658955e56c5c04da73595b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1e6c51c771a9c1094231a2fcc1b74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b152792760f70c640f46b69105b1613.png)
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f79913363a7b428a6864da81b4ffb727.png)
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【推荐2】已知直线
经过点P(1,1),倾斜角
.
(1)写出直线
的参数方程;
(2)设
与圆
相交于两点A,B,求点P到A,B两点的距离之积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c95fa7f61564978c8e26616bc14449e.png)
(1)写出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
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