解题方法
1 . 若
,则函数
的最小值等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02df9ff129c62404454accf457af2fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7177289a2f4302c9dbbcb14ef26fee.png)
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2 . 设命题![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
(
,
,
,且
);命题![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
(
,
).若
是
的充分不必要条件,则
的取值范围是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d356e8f2a12def2f4d83c35bfa65c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fbecd14beb36364a998e4a1389b4ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2d87651574e905b382cfc0f021bbca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e0c41a665bb2a7217bcf47fdfef40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f99aeee4e1fb7cec868ad469d6727fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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3 . 记不等式组所确定的平面区域为D,若以坐标原点O为圆心,r为半径的圆上的所有点都在区域D内,则圆O的面积的最大值是
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20-21高二·全国·课后作业
解题方法
4 . 定义
,已知实数x,y满足
,设
,则z的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a947126bc29005cfcc3aa1b8637cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dccf7fdc9ff5e9e6ed897ec3a716a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f31fa612bc42d3940dc57b9b0dc385.png)
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