1 . 在直角坐标系
中,以坐标原点为极点,
轴正半轴为极轴建立极坐标系,圆
的极坐标方程为
,圆
的极坐标方程为
,已知
与
交于
、
两点,点
位于第一象限.
(Ⅰ)求点
和点
的极坐标;
(Ⅱ)设圆
的圆心为
,点
是直线
上的动点,且满足
,若直线
的参数方程为
(
为参数),则
的值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cf89e94eb51129f144d9809ec290f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f77592c1394a534c6e4a426d4304a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.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/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅰ)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅱ)设圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e255ee2ad2b09fb9ba13af6314b6c66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c407eeb34204a1df967b8fbe481cb04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd54a8917aca626417db770753646581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b2657768ec78e4aceed2864755737.png)
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2 . 变量
满足
(t为参数),则代数式
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc34bc584347e488e3b512c312effb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd4c1f761a9c91d9d6af0411092439.png)
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3 . 若
,
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebcfd47ce43b1faea832fc0a28b5e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360c6b5f2ca5317e555e72ee2e6c51ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33efa5310fe10ca24ea6d6cf24f40f4c.png)
(Ⅰ)用表示数量积
;
(Ⅱ)求的最小值.
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