已知点
是圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a3fb6cbbfb0966a36272d4bbd355006.png)
上的任意一点,则所有的点
组成的平面图形的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a3fb6cbbfb0966a36272d4bbd355006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca16a3d715568b1d9833d73b094a4f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
更新时间:2017-05-18 00:23:17
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【推荐1】如图,在多面体
中,已知棱
两两平行,
底面
,
,四边形
为矩形,
,底面△
内(包括边界)的动点
满足
与底面
所成的角相等.记直线
与底面
的所成角为
,则
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
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【推荐2】已知在平面直角坐标系xOy中,
,动点P满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420d464c96149bd9cb5c7b1b3548133c.png)
则P点的轨迹Γ为圆_______ ,过点A的直线交圆Γ于两点C,D,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7b02a080e9c7d2b9d2c621bcde2d67.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ba05abdc8179e5ff980fb2d15ce2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420d464c96149bd9cb5c7b1b3548133c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a3363fbd9527e8aef45af8b302d01d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7b02a080e9c7d2b9d2c621bcde2d67.png)
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【推荐1】已知点
是直线
:
上的动点,过点
作圆
:
的切线
,
,切点为
,
,则当四边形
的面积最小时,直线
的方程为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f590ca2bde213675bffe68ed4017f957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】已知圆
与圆
,直线
交圆
于
,
两点,交圆
于
两点,
分别为
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3d627f5fbd04271389d503942d233.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec34d64d0de7e4eaa8020bdf38dedac4.png)
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【推荐1】数学美的表现形式不同于自然美或艺术美那样直观,它蕴藏于特有的抽象概念,公式符号,推理论证,思维方法等之中,揭示了规律性,是一种科学的真实美.平面直角坐标系中,曲线
:
就是一条形状优美的曲线,对于此曲线,给出如下结论:
①曲线
关于坐标轴和直线
均对称;
②曲线
恰好经过4个整点(即横、纵坐标均为整数的点);
③曲线
围成的图形的面积是
;
④曲线
上的任意两点间的距离不超过4;
⑤若
是曲线
上任意一点,则
的最小值是2.
其中正确的结论序号是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f866a668cc68eac53dfa72454a6d4523.png)
①曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3051f43ac48c0a730a791b8a93ad37.png)
②曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55256c64b7c8f55539a3a3e4db488c54.png)
④曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38209addb9e6c73f9e82f9bd59bb3ca.png)
其中正确的结论序号是
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【推荐2】圆C的极坐标方程
化为直角坐标方程为___________ ,该圆的面积为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0cb878349009a779d94b1bc40319bb.png)
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