1 . 对于实数
,
的不同取值,求关于
的方程
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a951f2a78ac3870b285128055f091e99.png)
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2023高三上·全国·专题练习
2 . 下列结论正确的是( )
A.东南方向与南偏东![]() |
B.若![]() ![]() ![]() ![]() |
C.从![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.俯角是铅垂线与目标视线所成的角,其范围为![]() |
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2023高二·全国·专题练习
3 . 两个向量的夹角
(1)定义:已知两个非零向量
,作
,则
叫做
与
的夹角;
(2)范围:夹角
的取值范围是_________ .
①当
与
同向时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
_______ ;②反向时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
_____ ;③当
与
垂直时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
_______ ,并记作
.
(1)定义:已知两个非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e8b95a61af300412fc65f846089028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cefb3de8805e7febdf23b4e959d9711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7e00f8bacce4d649b535449f04568c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
(2)范围:夹角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b657cfa91b6394e4b00fa385a2c0149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf21fef3026cfe445a855c94cab5c84.png)
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4 . 某社区要建一个矩形活动场所(如图),其中
为矩形,
为正方形,若场所周长为360米,设
米,场所面积为
平方米,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/b01cdf78-9232-477a-8b56-f527ee228068.png?resizew=164)
(1)写出
关于
的函数关系式,并指出
的取值范围.
(2)求
的最大值及
取得最大值时
的取值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6240d4cf0fb44aa1e6bdaf2a4bdfb37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/b01cdf78-9232-477a-8b56-f527ee228068.png?resizew=164)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2022高一·全国·专题练习
5 . 新定义:若一元一次方程的解在一元一次不等式组解集范围内,则称该一元一次方程为该不等式组的“相依方程”,例如:方程
的解为
,而不等式组
的解集为
,不难发现
在
的范围内,所以方程
是不等式组
的“相依方程”.
(1)在方程①
;②
;③
中,不等式组
的“相依方程”是 ;(填序号)
(2)若关于x的方程
是不等式组
的“相依方程”,求k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8e4bbc9f6c98374f360c90f4cc8940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3788cfd95beef71f146c508fbc387cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef8634d2d5a531ebffd843f50644b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef8634d2d5a531ebffd843f50644b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8e4bbc9f6c98374f360c90f4cc8940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3788cfd95beef71f146c508fbc387cc.png)
(1)在方程①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815650356afb1f42207c27d3b11635f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce0d12723a479d03bcdcf36b61dc9ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08863eecc79e481b27b550ee9f89d54f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5848b00576e5e657ce3ef889f117d04d.png)
(2)若关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b3493fcf2f0b76dfc7249a24c5556f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057ee5107a86fd287a33f5a5b706163d.png)
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