2012·山东烟台·模拟预测
名校
1 . 在实数集R中定义一种运算“△”,且对任意
,具有性质:
①
;②
;③
,
则函数
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a6d8c5f980cc6e2581d6ecdedb8cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be856e51e91c9b73ea09a8cf5592e12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18674648e607674799b7a6349c7c1ec4.png)
则函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8ae70317e872238cedab498414b453.png)
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11-12高三·山东烟台·期末
2 . 已知在平面直角坐标系
中,向量
的面积为
,且
,
.
(1)设
,求向量
与
的夹角
的取值范围;
(2)设以原点
为中心,对称轴在坐标轴上,以
为右焦点的椭圆经过点
,且
,当
取最小值时,求椭圆的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2031522e069b401e327110e535993fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb99c1873bfb3d6ed1aeab59179c2780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26337f5eab93cf705e9805dc9fc53c64.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9dd2c797c73a36923ed5abfd673da6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08493c1e001d85731cb4863ec38857fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f064ba4502a9845a3f06835514f5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)设以原点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8961b74ace912806f3c6af8ceaf5cfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0e6d3115e900f1a359ec4f894e8896.png)
您最近一年使用:0次