已知变换
将平面上的点
,
分别变换为点
,
.设变换
对应的矩阵为
.
(1)求矩阵
;
(2)求矩阵
的特征值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac7c28099bfbb7dc2a45ad166eace05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f8517cfd9f65700e01b67bce24728c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f0a070b397f2de0c60ab76680bad0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)求矩阵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)求矩阵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
2020·江苏苏州·一模 查看更多[2]
更新时间:2020-04-08 16:46:05
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解答题-问答题
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适中
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【推荐2】已知曲线
绕原点逆时针旋转
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(I)求由曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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(II)若矩阵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5839222b3af31d9baf4fb7c530d9b8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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解答题-证明题
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适中
(0.65)
【推荐1】在A、B、C、D四小题中只能选做2题,每小题10,共计20分.请在答题卡指定区域作答.解答应写出文字说明、证明过程或演算步骤.
A、选修4-1:几何证明选讲
如图,已知梯形ABCD为圆内接四边形,AD//BC,过C作该圆的切线,交AD的延长线于E,求证:
ABC∽
EDC.
![](https://img.xkw.com/dksih/QBM/2011/3/31/1570095178530816/1570095183478784/STEM/b97e9a1d3c294214b55318910da378b0.png?resizew=290)
B、选修4-2:矩阵与变换
已知
为矩阵
属于λ的一个特征向量,求实数a,λ的值及
.
C、选修4-4:坐标系与参数方程
在平面直角坐标系xOy中,曲线C的参数方程为
(α为参数),曲线D的参数方程为
(t为参数).若曲线C、D有公共点,求实数m的取值范围.
D、选修4-5:不等式选讲
已知a,b都是正实数,且ab=2.求证:(1+2a)(1+b)≥9.
A、选修4-1:几何证明选讲
如图,已知梯形ABCD为圆内接四边形,AD//BC,过C作该圆的切线,交AD的延长线于E,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2011/3/31/1570095178530816/1570095183478784/STEM/b97e9a1d3c294214b55318910da378b0.png?resizew=290)
B、选修4-2:矩阵与变换
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baaf6ae4ed0f84f4d71a56dc8637a74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9192e87c9f38eb0b37f7b0de686a69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4663e81a296458a7fd6c589271e52fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a335fc7c2c46946f0bf908c78bcc46fa.png)
C、选修4-4:坐标系与参数方程
在平面直角坐标系xOy中,曲线C的参数方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe3b717472fc1a095d495552cc2f5ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f42f41fb8ca0617e0b3aae5fe1495f.png)
D、选修4-5:不等式选讲
已知a,b都是正实数,且ab=2.求证:(1+2a)(1+b)≥9.
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【推荐2】已知矩阵A=
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