1 . 如图,圆内接四边形ABCD的一组对边AB、DC的延长线交于点P,另一组对边AD、BC的延长线交于点Q,自P、Q分别作该圆的切线PE、QF其中,E、F是切点,联结PQ.求证:以线段PE、QF、PQ为边构成的三角形是直角三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/f12e7533-ab26-444a-82b2-e3d7607bdc30.png?resizew=168)
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2 . 已知数列
:
,其中
是方程
的两个根,
求证: (1)对任意正整数
,都有
;
(2)数列
中的项都是正整数,且任意相邻两项都互质.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74df23ef1c8916c62f9b23a59c567f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffdbc2dd999c9e421bdc1e516d99206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d425033162db73dac1ec662964b120.png)
求证: (1)对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502fa2b7493da2df086efda58bc09ac7.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
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3 . 设
个质数
构成公差为
的等差数列,且
.求证
(1)当
是质数时,
;
(2)当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07db6ce04312bf94f979433d1caac1c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0679d49843bad1b49d905662b4e37ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc707cbf72459c71ed9ed6efe4d9395.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e6766e4cfdcfb19daf5a0fedf5df17.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4437eb75ca2a5cb8d467802bd48933c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77969cd0bf8081594e9364e4fdc5ac3a.png)
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4 . 如图,已知凸四边形
的对角线交于点
,
、
、
、
分别为
、
、
、
的内切圆圆心,且对应的内切圆半径
、
、
、
满足关系式
.
求证:(1)四边形
存在内切圆;
(2)
、
、
、
四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c8942e253abf1f64b09fa7d83b9e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314c024e7e1467e8c1e0ccdb96007462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2cb48c0a69b8c420c0b64b2bfa1ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4804e9b295d3b8de7f05e9c4e8e30a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780f3b16573bc64d001506f4ede38bbd.png)
求证:(1)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c8942e253abf1f64b09fa7d83b9e77.png)
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5 . 在△ABC 内部取n 个点, 将△ABC剖分为若干个小三角形(每两个小三角形或者有一个公共顶点,或者有一条公共边,或者完全没有公共点,如图所示).现将点A 染红色, 点B 染蓝色,点C 染黑色,其余n 个点的每个点也任意染上红、蓝、黑三色之一.我们称三个顶点的颜色恰为红、蓝、黑的小三角形为“特征三角形”.证明:至少有一个小三角形是特征三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c8aa8dc1-0cd6-4714-9df7-72e2c54641b7.png?resizew=146)
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6 .
内切圆的半径为
,直角的角平分线的长为
.求证:
的两条直角边的长
、
是关于
的一元二次方程
的根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42d4be9bf2b428beb750f4e445fe404.png)
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7 . 已知实数序列
的构成规律由递推关系
,
给出.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29fecaa6b3e14aaf1a20ccf2b39bbe7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d662dfb2f92ce2a810fae17274961849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1524c9441f8bdf59d0dac2a50aaf140e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323a14b9cde865c729442f5eb928b468.png)
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8 . 如图,在
中,
的平分线与
交于点
、与
的延长线交于点
,
的外接圆
与
的外接圆的另一交点为
.证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/1da11871-14de-4abb-b63d-3685c44e4a0c.png?resizew=149)
(1)点
在
的外接圆上;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef6568efecdabf9e1a2ebeb8438e997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88a11128d8f44ccc4f3d1cfdd7a9291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/1da11871-14de-4abb-b63d-3685c44e4a0c.png?resizew=149)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88a11128d8f44ccc4f3d1cfdd7a9291.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94b1e3395ab1caba285ca0a587542be.png)
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9 . 圆内接凸四边形
的面积记为
,
,
,
,
.证明:
(1)
,其中
;
(2)如果四边形
同时具有外接圆和内切圆,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8b617c2e617e996aa143787754f0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b3cb08a2f2c9cead5eb277eff93e8f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f3d5d27c3574355097050c813ebe8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71b79e8a0c10e0fb532fdf52392fee1.png)
(2)如果四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1800944aadb020608f2d943202473f83.png)
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10 . (1)若整数
满足关系式
,证明:
.
(2)试写出不定方程
的一组正整数解,并对此解验证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3aa7b21846db0187de8f2e8e124df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc3589455bf2ff459f7a6804f7377b55.png)
(2)试写出不定方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3aa7b21846db0187de8f2e8e124df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc3589455bf2ff459f7a6804f7377b55.png)
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