1 . 已知
为锐角,定义函数
.则函数
的值域为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c37c6922cb0df443ee1d41d6fc12aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
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2 . 关于
的不等式
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459b89bd50fe7cddfd0ec746e2f4eff5.png)
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3 .
等于.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddb09af57687dc48a8710b1e172bdaf.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 如图,在四棱锥P-ABC中,AB∥CD,
,
平面ABC.若PD=AD=AB=1,CD=2,则平面PAD与平面PBC所成的二面角
的平面角的正弦值
等于
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101630561452032/2105366745890816/STEM/4b1a3856-083e-4480-9428-d350a3d102f8.png?resizew=288)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101630561452032/2105366745890816/STEM/4b1a3856-083e-4480-9428-d350a3d102f8.png?resizew=288)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . △ABC三个内角的正切值皆为整数, 如果将彼此相似的三角形只算作一种情况, 那么,全部符合条件的三角形的情况是.
A.不可能有 | B.只有一种 |
C.无数多种 | D.至少两种,种数有限 |
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6 . 设x、y为实数.若对于满足
的任何实数
,都有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b58b0c3ea875307f6b9f7086bb413b8.png)
成立,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d1b6097a93701ce46f4bffaf22b349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc14778010a33f90902ff17b1ec0ac73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b58b0c3ea875307f6b9f7086bb413b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a636b0be21f3f4e1feff543e33ba0e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
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7 . 若方程
在
上有两个不等实根,则正整数n的最小值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9cb6fb27c75a7ebe0425dd42f744845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c87874458fabe50aff5e19d586d5d94.png)
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8 . 若
,且直线
是函数
的一条对称轴,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434fab3f99cc5c1beec9f7055f863b28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24db7b603aebdee8e298d1fe49c848e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b6641fb1bc9aa2986cc1f0cd805a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
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9 . 设
、
、
都是锐角.给出下列三个命题:①
,②
,③
、
、
成等差数列.则由①、②、③中两个推出第三个所得的命题中,真命题的个数是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af22b8a9627020041ebb976eb4d4be14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ba7517a258838e45020532d5cb80d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
A.3 | B.2 | C.1 | D.0 |
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10 . 已知
的外接圆圆心为
,
.则( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe30bdfbb4ba7c700665304ccef7647.png)
A.![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.![]() ![]() ![]() |
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