2014高三·安徽·竞赛
1 . 设动点
.则线段PQ扫过的平面区域的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c49658b267e56cff468964dec1d3dd9.png)
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11-12高三上·安徽蚌埠·阶段练习
2 . 设对任意的正整数
,都有
.则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e582005b76df9ddea85f298d36f01e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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3 . 如果
、
、
是三角形的三边长,且满足
,则这个三角形的形状是______ .
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cd417d54a0e0dee5bfb94bf1f5971f.png)
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