1 . 求最小的正整数
,使得当正整数点
时,在前
个正整数构成的集合
中,对任意
总存在另一个数
且
,满足
为平方数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d2ba3c51d2726df8cee0918b8af2d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc6a0568db5a3fc7aca3366e608cf69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acfc595518cf752e1c7903dfff93dbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7580ce638933a1c81da5e2e1b656c77a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7741c8d8f0486556a102d904fb26a7be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
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2 . 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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3 . 若双曲线
的两个焦点恰是椭圆
的两个顶点,而双曲线
的两个顶点恰是椭圆
的两个焦点,则双曲线
的方程为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1211bc23e6147dcde7613c0307afb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
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4 . 对于正整数
,将其各位数字之和记为
,各为数字之积记为
.若
成立,就称
为“巧合数”.则所有巧合数的和为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9efab4b3abc0630182a696f0216b3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab2e7f7f9ea6d1dcaf060c783c756b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2237b7287e636e1da40c7487a0fa3918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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名校
5 . 在四面体
中,面
与面
成
的二面角,顶点
在面
上的射影
是
的垂心,
是
的重心.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d151cd24c2f9c320eb54e69d71e5cb46.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc9158cca5bd9107685e57bef6e3477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d151cd24c2f9c320eb54e69d71e5cb46.png)
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2018-12-06更新
|
202次组卷
|
3卷引用:2008年全国高中数学联赛江西省预赛试题
6 . 已知数列
满足
若
,则正整数m、n的一组解为{m,n}=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b2f46bbee45694ada713e3656e5351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002805956f39a1efdbe00a36d79f28cb.png)
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7 . 把1至n(n>1)这n个连续正整数按适当顺序排成一个数列,使得数列中每相邻两项的和为平方数.则n的最小值为______ .
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8 . 如图,P为正方形ABCD内切圆上的一点,记
,
则 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821063de4792cf9b829f36420f513929.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa26fadeee2becc192fa53d778445d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac0f6183a22f364323d04916ed931ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821063de4792cf9b829f36420f513929.png)
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089398193160192/2089561266954240/STEM/273ea2171b4a42dfbb8cee335aa7925d.png?resizew=152)
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9 . 设x、y、z为正数,满足
.
证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71270e32f7de4545f8c927b1bf7207c0.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3046e9788d7cfe45106ae614af00131.png)
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10 . 如图,D为△ABC的旁心,点A关于直线DC的对称点为E.证明:
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089398193160192/2089561267060736/STEM/08415767a40e426aa40ea52ce1b5e09e.png?resizew=177)
(1)B、C、E三点共线;
(2)A、B、D、E四点共圆
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089398193160192/2089561267060736/STEM/08415767a40e426aa40ea52ce1b5e09e.png?resizew=177)
(1)B、C、E三点共线;
(2)A、B、D、E四点共圆
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