1 . 如图,在
中,已知AB=5,BC=8,AC=7,动点P、Q分别在边AB、AC上,使
的外接圆与BC相切,则线段PQ长的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc3919b5000f9af77ddb77a62bee9c9.png)
![](https://img.xkw.com/dksih/QBM/2018/12/19/2100144453959680/2105644056477696/STEM/d141a86a-ace6-49ca-acff-c46eeccb3971.png?resizew=259)
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2 . 如图,走廊宽为3m,夹角为120°,地面是水平的,走廊两端足够长,问:保持水平位置通过走廊的木棒(不计粗细)的最大长度是多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/cb5688e3-6afc-4180-b181-14adb9553acb.png?resizew=127)
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3 . 设
是整系数多项式,
,又存在n个不同整数
,使
.则n的最大值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6bfdb24ecf5da863405c2b40936ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acc6f74d08b0e13914ea33fd30501fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4276b4e325156c40ae0713793728ac83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972b31c5420db18784db3d3858227489.png)
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4 . 满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a703c80c9a9624b08ada02523257b4.png)
的
位十进制正整数
共有______ 个(用数值作答).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a703c80c9a9624b08ada02523257b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ba2efb4674cbc52ce744836fb0e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627a57cd9fdb1f586f35d9825b6bcc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c73c250dde64fa3fa4c11d31b9b4e7.png)
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5 . 已知
是双曲线
的两个焦点,M是该双曲线右支上的点,O为坐标原点.若
,则点M的坐标为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38928a92bc4b44ed3c9b89769f5372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1fa37c4c826b5dcfebe86ab6177906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89ba9bf8e0b4755db6878267a007f08.png)
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名校
6 . 设甲袋中有4只白球、5只红球、6只黑球;乙袋中有7只白球、6只红球、2只黑球.若从两袋中各取一球,则两球颜色不同的概率是________ (用最简分数作答).
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7 . 若n个正实数
使等式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b10c9fa326ebbe0351e09a9ae999c08.png)
成立,则
的值分别是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cdf2d417394eaca75df95e1b9eae30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b10c9fa326ebbe0351e09a9ae999c08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3f2d189f1fe8433aee944beaa2d44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cdf2d417394eaca75df95e1b9eae30.png)
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8 . 平面直角坐标系内有
,顶点为
,两平行直线
,
之间与
公共部分的面积记为
,则当t变化时,
的最大值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f0a3814a55058f41b94976f213f2b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f7d2c91996ac83fe63251100926b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5451a66fb4f48811e042d8ca250f51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5451a66fb4f48811e042d8ca250f51.png)
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9 . 函数
的定义域是________ ,值域是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5306e75bc63ed2571a3a2573802f6263.png)
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10 . 设数列
的通项公式是
(
表示不超过实数
的最大整数).
(1)证明:
、
、
、
、
都是数列
的项;
(2)
是否是数列
的项,证明你的结论;
(3)证明:有无穷多个2的正整数幂是数列
的项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb99cff0dff5b60579c25d765f016f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad4668cc927e277289b2af718f0d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6648bc986a558fa32e752d28d3a68431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa6ec171ea9f8e9be9bf13baea05cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955079ed2708734e50394387cf40c111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed76985f3bec401fc8767c1759037392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)证明:有无穷多个2的正整数幂是数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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