1 . 数列
的各项均为正数,其前
项和
满足
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9583a4d9bf7b954042226232d23a8c19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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2018-12-28更新
|
743次组卷
|
3卷引用:数学奥林匹克高中训练题(152)
2 . 已知正整数
满足
,
.则
的最大值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69446c2f2864ee2e16f3ced699dfdfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0f053ac10d7aa83523c4fed5d99420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58089c47aa8429f75fdc85c48822a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
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3 . 设
是锐角
所在平面内一点(在
外),
于点
.若
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e790b18744cd5aea7cb42ff984186a0.png)
_________ (用
表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63ab71efa010821650ffe08bd907f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb329df541e02373a5321a09aa31ffe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e790b18744cd5aea7cb42ff984186a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38fe2c71e008615306cd00dd26ac34d.png)
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4 . 设曲线
的一条对称轴为
.则曲线
的一个对称点为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7e41b20438cd6107be51990460278f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af26da329d5a2f07875856b3529952e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ad5ae3fa5c06368111f4165267bb00b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 设函数
满足:对任何实数
,有
.则这样的函数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72da5289e72a9a02baa387ba91bf6d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
A.不存在 | B.恰有一个 | C.恰有两个 | D.有无数个 |
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6 .
满足
.则
是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62bbe32fa9af3fdbfbae3a09a766ace.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.直角三角形 | B.锐角三角形 | C.钝角三角形 | D.等腰三角形 |
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7 . 注意到6!=8×9×10.那么能使n!表示成n-3个连续自然数之积的最大正整数n为__________ .
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8 . 两人约定:在某天一同去
地,早上7点到8点之间在
地会合,但先到达
地者最多在原地等待5min分钟,如果没有见到对方则自己先行.设两人到达
地的时间是随机的、独立的、等可能的.那么,两人能够在当天一同去
地的概率是______ .
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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9 . 给定正数
、
,对
、
,且
.则
的最小值为______ .
![](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/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800979356d015aaf5772c4334f31e5ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db92a10a04cdd1b1d81966243744993.png)
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10 . 设四面体
是正四面体,
是边
的中点.则异面直线
、
间的距离
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
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