1 . 如图,圆锥的轴截面为等腰直角
,
为底面圆心,
为底面圆周上
的三等分点,
.则
与
的夹角为.
![](https://img.xkw.com/dksih/QBM/2018/12/18/2099415256596480/2100936953995264/STEM/62215545-4e34-4225-a7d8-047f982fdd1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916c817cb011fbb4717e5c5eaf187d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d14ca71e1e5f31fb4246e196ca3b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15057403dfc0a732373b407f50e4137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://img.xkw.com/dksih/QBM/2018/12/18/2099415256596480/2100936953995264/STEM/62215545-4e34-4225-a7d8-047f982fdd1c.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2 . 方程组
有实数解.则
的取值范围为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b76dbaca86840f17b61b14916c38e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3 . 已知自然数
不是5的倍数.则5除
,
时,有.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfab9d144cdaf7dcf5dd7e445fdeca45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd8ba6639589dacee1706f71d3c296d.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.不能确定,都有可能发生 |
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4 . 函数
在
上的最大值
与参数
、
有关,当
最小时,
、
的值分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf4c3c22db429d92e8313c79c97e559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f78951f3ec08d858d43e7cd8298400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 设递增正数列
,
,…,
是分母为60的既约真分数.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e705c812960b541685c6c895fc9ecec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e705c812960b541685c6c895fc9ecec.png)
A.0 | B.8 | C.16 | D.30 |
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6 . 设
,且
,则
的最小值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476809afe0708f5b896af5b1d7acbb8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9f2c39bb3e7f3acb52581fef679c6c.png)
A.![]() | B.2 | C.![]() | D.4 |
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7 . 在边长为8的正方形
中,
是
的中点,
是
边上一点,且
,若对于常数
,在正方形
的标上恰有6个不同的点
,使
,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd982693d8c1e858606bf1daa480dd0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a206fc5a4efd988c61b79cbb9b527b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知
,且x+y+z=1.如果x、y、z中没有一个数大于另一个数的2倍,那么,乘积xyz的最小值是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1294ab74b14bec1ed39674b99e3bdc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 对于任意的
,不等式
恒成立.则m的取值范围是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c955b1c5c5190358590b1249cec8a4.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
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10 . 已知
是棱长为a的正方体,E、F分别是棱AB、BC上的动点,且AE=BF.若
与
所成的角最小,则有.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd694ad3a4733c7c84aaa7946aeea4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f157dfa84c959ddb9324ed303a70d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc94f827530a2b2f4aa0a6b1236e7f4a.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次