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
都是正数,对实数
和
总满足
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e3d172f08313520e76b6cbc2ff9980c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242700a13f433b6a81ceeda0888ad6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763c46235a1b61b0448dae108ec7b548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7929edd067d1187739f1529fdb95597.png)
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3 . 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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4 . 如图,
是已知圆的一条弦,它将圆分成两部分,
分别是两段弧的中点,以点
为旋转中心,将弓形
顺时针转一个角度成弓形
,
的中点为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176385d91d5e29324fce4a932eff6a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877bda7e850ca4a33e517fcf4a082b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7f1c631d2e85ad7d736429e25aa5f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/e9393bb3-fa8a-486e-bad9-a24e4efdb052.png?resizew=146)
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5 . 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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6 . 已知
.求证:关于
的二次方程
,
,
中至少有一个具有两个不等的实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6615a744a90deb94ee2bc608eabeb8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e8ab47e1d51af185afd2ca39f61081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a60dc74603b60998930125a04e7c618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58035f101382a611fbbfc422d16fea7b.png)
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7 . 已知半径分别为 R 、r 的两个圆外切于点 P , 点 P 到这两圆的一条外公切线的距离等于d .求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a951829c7a4dc0c4b2f493f594f322.png)
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8 . 北京市中学有
(
)名中学生为“北京奥运会”共提交了
条不同的建议.已知其中任两名学生提交的建议中至少有一条建议是相同的,也至少有一条建议是不同的.求证:提交建议的学生数
不超过
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17bda892497cea43df67db57b4e2a07a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f1ad18371ec533aeac27cf1fad95c1.png)
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9 . 已知
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e96f2368d04db6d0e05de46e97e29f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd930c5e54cb31e244d37de0aff01e8.png)
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10 . 定义在区间
上的函数
满足
,且对任意的
都有
.
(1)证明:对任意的
,都有
.
(2)求
的值.
(3)计算
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f579faac22a78b4740d7cf18879a6e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a6c0fddb9074dfc96be03b4aa24d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44600bf101883484728578e88c082ba3.png)
(1)证明:对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f046b095637bb51f5bfc291ead8826.png)
(3)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7296cdaa03c8e74adb92d5ce4b5632.png)
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