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1 . 不等式组
所表示的平面区域的面积为______________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6d39ecc76ff5a60627b135dc09910c.png)
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2 . 函数
的最大值是______________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b705dbbf5b5ee046dd568a11cacf3fb5.png)
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3 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6713e8f6cadd40aca3994ebed40fdd.png)
______ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e259fb2a5d5910850f403ef38b537e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6713e8f6cadd40aca3994ebed40fdd.png)
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解题方法
4 . 已知直线
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
_____________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2569e190fa3889b3dad02eba7d03c7d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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5 . 由一组样本数据
求得的回归直线方程是
,已知
的平均数
,则
的平均数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb39770805fd462a4967366119d60df.png)
______________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433cba3aca2eb187a0d2ec85f346744d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a21c367999c5960bc9f1c2f7c6252da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35903de08b1791886418899ac6cebe95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb39770805fd462a4967366119d60df.png)
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