1 . (几何证明选讲选做题)如图,圆
的弦
、
相交于点
,若
,
,则![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/24192d893bb340de9fdab0eda95f3c66.png?resizew=39)
________ .
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/f572152b778243ce8855cdcd64259b34.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/337bdc75c3764220ac4d28ec19b638fe.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/ad437865315646c88f086ee877f0c8a3.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/9c13a04e514940e6b3e499751f18c2ca.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/037d83e48c4442b2b51546a37bce43dc.png?resizew=93)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/8f32a562360142b5b188b1fbbf62a4e8.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/24192d893bb340de9fdab0eda95f3c66.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942404096/STEM/5fdc774e84644cd4ba554a1e881709c3.png?resizew=145)
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2 . (坐标系与参数方程选做题)在极坐标系中,曲线
上到直线
的距离为1的点的个数是________ .
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942379520/STEM/2ba3a9ea3f5d474d829e1f214f68508e.png?resizew=41)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942379520/STEM/591691580bd84a379c470abe96a560f4.png?resizew=109)
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3 . 已知
与
之间的几组数据如下表:
假设根据上表数据所得线性回归方程为
,根据中间两组数据(4,3)和(5,4)求得的直线方程为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
____
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
___
.(填“
”或“
”)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942363136/STEM/59b0043fe4004fda9a066e4090f7a56c.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942363136/STEM/075eb8da8ac548a287653b5ebfc3b806.png?resizew=13)
![]() | 3 | 4 | 5 | 6 |
![]() | 2.5 | 3 | 4 | 4.5 |
假设根据上表数据所得线性回归方程为
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942363136/STEM/8db7eda274774d9b912cfb5bece85e95.png?resizew=65)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942363136/STEM/f4b69e0c28a9477e9f24b190f6972236.png?resizew=69)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942363136/STEM/e11e4f62755f4abd88d17062f7578b5f.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572091936956416/1572091942363136/STEM/80f25d0c159a4a799b6d0ad2e69de13e.png?resizew=13)
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4 . 如图,正方体的底面与正四面体的底面在同一平面
上,且棱AB所在的直线与棱CD所在的直线互相平行,正方体的六个面所在的平面与直线CE、EF相交的平面个数分别记为
,
,那么![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/5ac282b443f147f5ad94be1a68137483.png?resizew=25)
_______ ;![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/5f69ef9951174210bf8e02f1e40a97c1.png?resizew=23)
_______ .
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/0249662491814acc9f2153aa31d32a13.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/0801cb7d4ee5411cb3495acf153e41e5.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/8c7bea1765174a52a0c177c6ee27467a.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/5ac282b443f147f5ad94be1a68137483.png?resizew=25)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/5f69ef9951174210bf8e02f1e40a97c1.png?resizew=23)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747516928/STEM/33336b0144f64ee6922b8f1d6af380e7.png?resizew=238)
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解题方法
5 . 若函数
满足条件:①
,
;②
,
;③
.则(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3c988d875438535244ee2b092a779b.png)
_______ ;(写出一个满足条件的函数即可)
(2)根据(1)所填函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba6f464aa447524ec2e4183abb6e64f.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018857ec6e498113b3b12a730d9313da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d200a7afe1e011713e14886a6887e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814445ae55e7426277e0f6888603ab34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db98efa3d9f09a65fc4c88a32cdc0e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3c988d875438535244ee2b092a779b.png)
(2)根据(1)所填函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba6f464aa447524ec2e4183abb6e64f.png)
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6 . 若变量
,
满足约束条件
,则
的最小值为_______ .
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747475968/STEM/e58b7912af154a3eabd961acab11b262.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747475968/STEM/a288fdcf7d9c4be6aee97466368a4b94.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747475968/STEM/7bdff981fb7948b48b0b4892376da084.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747475968/STEM/d51b6ff87bcc40ba83af27b529f641bb.png?resizew=64)
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7 . 已知定义在区间
上的函数
,则
的单调递减区间是_______
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747492352/STEM/a31b6f1e250f4b07b6a41529c2d208ef.png?resizew=55)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747492352/STEM/6c2106507e4f4f0498bb3aa9ac68f52a.png?resizew=117)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982742347776/1571982747492352/STEM/609100dd316c48778d071501d3ff15fb.png?resizew=31)
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8 . 计算定积分:
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479039b49d0c2138b969eb74096cb59c.png)
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9 . △ABC是等腰直角三角形,已知A(1,1),B(1,3),AB⊥BC,点C在第一象限,点
在△ABC内部,则点C的坐标为_______ ,
的最大值是_______ .
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634336256/STEM/9c8ebc47554840b5864d631babaf912e.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634336256/STEM/57a23bae0afe4abebe1ca7d3027fb951.png?resizew=64)
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10 . 已知数列
满足
,
(
),计算并观察数列
的前若干项,根据前若干项的变化规律推测,![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/2d6c340259d54ccf80717bf6f86d910a.png?resizew=45)
_______ .
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/570036bd37a5495f85359a84186d4f5d.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/f4a22030f0bf4e1381721a606116ad28.png?resizew=51)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/a868b883d0964bf580c8f412eea447cb.png?resizew=76)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/8162f987f0b14dfbaa76e642aab193f8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/570036bd37a5495f85359a84186d4f5d.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571982628601856/1571982634401792/STEM/2d6c340259d54ccf80717bf6f86d910a.png?resizew=45)
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