名校
1 . 在平面直角坐标系
中,对于任意一点
,总存在一个点
满足关系式
,则称
为平面直角坐标系中的伸缩变换.
(1)在同一直角坐标系中,求平面直角坐标系中的伸缩变换
,使得椭圆
变换为一个单位圆;
(2)在同一直角坐标系中,
(
为坐标原点)经平面直角坐标系中的伸缩变换
得到
,记
和
的面积分别为
与
,求证:
;
(3)若
的三个顶点都在椭圆
上,且椭圆中心恰好是
的重心,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495984a7f99222eb03bf296260fac7b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882fe79977fce2cc7c289b0da1721c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(1)在同一直角坐标系中,求平面直角坐标系中的伸缩变换
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4f007b1ceaccfff1d659f6f8592c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78847dd23bb54d5d960016e6beeb5713.png)
(2)在同一直角坐标系中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882fe79977fce2cc7c289b0da1721c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21e44af368f3336354704d92609f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21e44af368f3336354704d92609f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/150a135bbd528daf3f19a58a621a57c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793b3bfc799e7cd6a795324ca02aaa23.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
您最近一年使用:0次
2023-01-10更新
|
457次组卷
|
2卷引用:上海市七宝中学2023届高三上学期元月模拟数学试题
名校
解题方法
2 . 已知直线
为参数,
)经过椭圆
为参数)的左焦点
.
(1)求
的值;
(2)设直线
与椭圆
交于
两点,求
的最小值.
(3)设
的三个顶点在椭圆
上,求证,当
是
的重心时,
的面积是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5869a94f9eb1bf7b6bdccb7d62657204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa59dbbca1330b8095f30ae810772fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1befa136d34a01daa1f93b840991870b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)设直线
![](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/2f0305037a99384cdfe88cb03fbdfe1a.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c28abb154f41e1ca9816c9c9c2433ca.png)
您最近一年使用:0次
3 . 在平面直角坐标系
中,对于任意一点
,总存在一个点
满足关系式:
(
,
),则称
为平面直角坐标系中的伸缩变换.
(1)在同一直角坐标系中,求平面直角坐标系中的伸缩变换
,使得椭圆
变换为一个单位圆;
(2)在同一直角坐标系中,△
(
为坐标原点)经平面直角坐标系中的伸缩变换
(
,
)得到△
,记△
和△
的面积分别为S与
,求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb4db5074e7c8945c1800f1cc324be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754780ccfb7aea6a9902a11e490c94cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8964e0587e20d06a9a401808cb4575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf73db6da96b2e3ef7b70beecb22363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00efb6b051a61e5a1f0a6b429b616974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(1)在同一直角坐标系中,求平面直角坐标系中的伸缩变换
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795b28d4816617d5f344dce62d7a533.png)
(2)在同一直角坐标系中,△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571f8dfb1eb003438f27bab2324140ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425b7513e7aaa5306945435e48604bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf73db6da96b2e3ef7b70beecb22363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00efb6b051a61e5a1f0a6b429b616974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb48c5f1c6e24fe7b8944ad007795e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571f8dfb1eb003438f27bab2324140ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb48c5f1c6e24fe7b8944ad007795e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e030dbd6f1af3802272609cca6f1148.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1c7abe77a98f5df66d9bd3111e9dfb.png)
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