1 . 如图所示,BE、CF分别是锐角三角形△ABC的两条高,以AB为直径的圆与直线CF相交于点M、N,以AC为直径的圆与直线BE相交于点P、Q.证明:M、N、P、Q四点共圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/40cc047d-0d43-4ede-b499-1661d2553765.png?resizew=232)
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2 . 将正整数数列1,2,3,…中凡是被4整除以及被4除余1的项全部删去,剩下的数按自小到大的顺序排成数列
,再将数列
中,凡是下标被4整除以及被4除余1的项全部删去,剩下的项按自小到大的顺序排成数列
.证明:每个大于1的奇平方数,都是数列{bn}中的两个相邻项的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8748938373768d7172dc2a8d43ee2d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc7e469f2b0f49e94895bc2e3de2e47.png)
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3 . 设椭圆C的两焦点为
,两准线为
,过椭圆上的一点P,作平行于
的直线,分别交
于
,直线
与
交于点Q.证明:P、F1、Q、F2四点共圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/237c115d5b39d761e1cbcae031070b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691b66aff81e75f4d3873fd4ef7893a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008f02ab36d70f2a1af5c200b20bea28.png)
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4 . 如图,
的内心为
,
、
、
分别是边
、
、
的中点,证明:直线
平分
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445d7497f41656d5d3115dafef213972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/892447cf-89df-42b6-a265-f87e3795ba71.png?resizew=182)
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5 . 已知
是
斜边
上的高(
),
分别是
的内心,
的外接圆
分别交
于点
,直线
交于点
.证明:
分别是
的内心、旁心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2f5f6d9efe3852a2329ea927abcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0248166f5a50eb4fe7f8a02a2d8e397e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66cd093002b9d92a486ece991951867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc50698075eae3370880c4622702bc94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c877203215bd4cdc93dd0a6cb66f551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0248166f5a50eb4fe7f8a02a2d8e397e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0277c30384fca9fc29a1ea56ade6d083.png)
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6 . 如图,在△ABC中,AB=AC,M是BC的中点,D、E、F分别是边BC、CA、AB上的点,且AE=AF,△AEF的外接圆交线段AD于点P.若点P满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a4d69a750fce9910cdd42cfe81b877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2261ff162981af872f31b7ce33c18c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/521d3799-aac7-41a8-b3b6-b7989484145c.png?resizew=135)
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7 . 如图,在
中,
分别是直角边
上的任意点,自点
向
引垂线,垂足分别是
.证明:
四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670101297f1af48f0f345e6ce3a05c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8035ff4a45af9535e540f7beb358a886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8035ff4a45af9535e540f7beb358a886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/bf960d40-7083-4979-acbf-6350858b5cda.png?resizew=218)
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8 . 证明:对每个正整数
,存在正整数
,使得能将前
个正整数所排成的数列1,2,…,
顺次分成这样的
段,其中每一段的各数之和均是平方数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab2e7f7f9ea6d1dcaf060c783c756b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab2e7f7f9ea6d1dcaf060c783c756b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab2e7f7f9ea6d1dcaf060c783c756b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2012高三·江西·竞赛
9 . 数列
定义如下:
,对于每个
,
、
、
构成公差为2的等差数列,而
、
、
构成公比为
的等比数列.证明:
为有界数列,并求出其最小上界.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4613271f782a90ab580131d09d03d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbbadf02a2855e91a86dedc7a98781a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c857188ddff35b4ad7b5f84faed4dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f88a082279aa9213f01e649adea2011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f88a082279aa9213f01e649adea2011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc12e0dca8dfa985a399aa0db6b9ef87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05ede16e60dd95c83915caf0f3034978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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10 . 如图,
为锐角
的垂心,在线段
上任取一点
,延长
到点
,使
,作
⊥
于点
,
⊥
于点
,
为线段
的中点,
、
分别为
的外接圆圆心、
的外接圆圆心,
与
的另一交点为
.
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089522158157824/2091018942070784/STEM/011fe07321f2478fa0afaf0b73140502.png?resizew=265)
证明:(1)
、
、
、
四点共圆;
(2)
、
、
、
四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db07ea445a0c3173db0785d98694671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/e24e9da4baf5f37f723a7577d2cb30f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6049d4b46388bf0ca110cc6c8d84d908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089522158157824/2091018942070784/STEM/011fe07321f2478fa0afaf0b73140502.png?resizew=265)
证明:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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