解题方法
1 . 设直角坐标平面上两个区域为
,
,记
与
的公共部分面积为
.当
时,则
的表达式为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7b4d2af45f4af001a08d49d1161ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6d5db1f2427972e79de8f6eee18082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23865ee52040331dee23621b4a15c244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
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2 . 不等式
对任意t均成立,则
表示的平面区域的面积为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62e08bc2049b01db02af62c07937050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62e08bc2049b01db02af62c07937050.png)
A.2 | B.![]() | C.![]() | D.3 |
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3 . 向量
,
为坐标原点,动点
满足
,则点
构成图形的面积为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68653fdc5914824f070c4f04eda5c19b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8701e0cce437edc830438b4fe6277d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b5ec4981bc027e708db205086e5a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28468af14c93b04d44e155e820fb65e.png)
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