1 . 如图,已知二面角
的平面角大小为
,垂足分别为
,
,若
,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85090c2a2908e87ab478e0851b0511e1.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/cac2abb07333587864b46245ef627ab8.png)
A.直线![]() ![]() ![]() |
B.点![]() ![]() ![]() |
C.平面![]() ![]() ![]() |
D.三棱锥![]() ![]() |
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解题方法
2 . 已知在
中,
的面积为
.
的度数;
(2)若
是
上的动点,且
始终等于
,记
.当
取到最小值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d80664a665cbdff97f0c2c47541d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12c3a75358a870c58549cf88b82fcc18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4538fa852e0f4961d442e9d5b96a69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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3 . 已知函数
为偶函数,将
图象上的所有点向左平移
个单位长度,再把图象上所有点的横坐标变为原来的
,得到函数
的图象,若
的图象过点
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6302c662850e68c5255a179ebd235c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1bb3229fd3302edbee5fcb83be491d6.png)
A.函数![]() |
B.函数![]() ![]() |
C.函数![]() ![]() |
D.函数![]() ![]() |
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解题方法
4 . 下列选项正确的有( )
A.若![]() ![]() ![]() |
B.复数![]() ![]() ![]() ![]() ![]() ![]() |
C.若复数![]() ![]() ![]() ![]() |
D.若复数![]() ![]() ![]() |
您最近一年使用:0次
5 . 已知在棱长为2的正方体
中,挖去一个以上下底面各边中点为顶点的四棱柱,再挖去一个以左右两侧面各边中点为顶点的四棱柱,则原正方体剩下部分的体积为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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6 . 如图,在正方体
中,
,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484da2e23a7f6ec85757d4fdc7473102.png)
A.![]() ![]() | B.平面![]() ![]() |
C.![]() ![]() | D.平面![]() ![]() |
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解题方法
7 . 已知正项数列
的前
项和为
,且
,则
的最小值为______ .
![](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/f0b066416d8d61e8666b3b9d5d24a789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cc5a3d0a69fdf4297ce92c048a5de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7023d3a92d97b12ca99cc05f105115.png)
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8 . 已知正三棱台的上、下底面边长分别为
,体积为
,则该正三棱台的外接球表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a01cfd85099af301ec78b409e94f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c22ec422e693c68a141b38b321ddda9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
9 . 已知函数
的图象与圆
有两个交点,则
的取值范围为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b1d897bf1170f96cac0c36823a512a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e184f82344c10a46979f9beb363618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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10 . 已知函数
,且
,若
在
上有
个不同的根
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c05b5d8ecf0b6afc9d601ce54243039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e050166d59c1e3ff85359d9d4367b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9e57f9051895c43eb87215f444a8bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bccd6a6e85bdf500218a3e75b31f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1c31a81f198c443e71b83ca662939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39895e952594e664ca843989cba48d90.png)
A.0 | B.![]() | C.![]() | D.不存在 |
您最近一年使用:0次