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1 . 已知二次函数
满足以下条件:①经过原点
②
,
③函数
只有一个零点
(1)求二次函数
的解析式;
(2)若对任意
,
恒成立,求实数m的取值范围:
(3)若函数
与
的图象有两个公共点,求实数t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b6a9ffffc0c461881b427c543924cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/935799b8d9f3de0c021e2a7df70d96f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190a6120c3330c51d0823c8bd8991b2a.png)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f698c5a46ab32f72dc313d37f024accf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d23e92f9e145cf650d43affe7d5b03.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8082b007c399bb2e4cceb668c84f99d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41eae03fbd650f093324d11b6ea7429.png)
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2 . 如图,在四棱锥
中,底面
为平行四边形,
,
平面
,
.
![](https://img.xkw.com/dksih/QBM/2021/9/14/2808027926511616/2808870266445824/STEM/651a2655-97e0-4a24-9f2f-fdaf1f5d8850.png?resizew=268)
(1)证明:
平面
;
(2)若
,PB与平面
所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4cb73e9d976cbfe9c590044fa69dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
![](https://img.xkw.com/dksih/QBM/2021/9/14/2808027926511616/2808870266445824/STEM/651a2655-97e0-4a24-9f2f-fdaf1f5d8850.png?resizew=268)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c7a937699f989b685f285041434000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
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解题方法
3 . 在
中,
,
,
的外接圆半径
.
(1)若
,求
及边长AB;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e1bd4f72b3edd9647378d1191857fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216b110085d23ed0dce6210f2d3ba439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e159fa38488741d395ea9cb03386b1ad.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cd9ae7e6429db3fc302aca0d562245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c93a7bf0682398f09fa36fd212d9f2.png)
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解题方法
4 . 如图,在棱长为4的正方体
中,设E是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/e0cf4309-87e9-45d4-9c67-9cea9375adc1.png?resizew=157)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/e0cf4309-87e9-45d4-9c67-9cea9375adc1.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c1acd7da8817385417e1dff25bfe25.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63fa0d9702ebcae364f0d06db855a29.png)
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解题方法
5 . 袋子中有5个大小形状质地完全相同的球,其中2个白球(标号为1和2),3个黑球(标号为3、4和5),从中不放回的依次随机摸出2个球,设事件
“第一次摸到白球”,事件
“第二次摸到黑球”,事件
“两个球颜色相同”,事件C的对立事件为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6117b8f97f2e8f6fda0af863bf0ca.png)
(1)用集合的形式写出试验的样本空间
,并求出
.
(2)求
和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6117b8f97f2e8f6fda0af863bf0ca.png)
(1)用集合的形式写出试验的样本空间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e92006f80b06423bb0a2c0e28d704d3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e37f32bef5568fcdef4b368232b1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb6b15808a7b7b8b6ca7e5f7b352657.png)
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6 . 已知函数
(e为自然常数,
),
,若
,总
,使得
成立,则实数a的取值范围为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2bd16b90823d5f56ffd6c7aa8c8e8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7739fabf233e5b2136faf751a7ebc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8158add9f7d495e043698520fca9d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8688297990e6616b7e1b8ee2269b37e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2c4bc899a4fa555ad9f927e73cca21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e63bbadc6250f7139836ede33205550.png)
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解题方法
7 . 在
中,角A,B,C的对边分别是a,b,c,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981661032b5b2154a5877dd7eb14551.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f34bfc6d8c68bc529c8d8ae8f90eb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe29c42302504e7fd8577dbc7d130ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981661032b5b2154a5877dd7eb14551.png)
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8 . 若
,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0701c46829d1cf4e3e39a57ea65cf8d.png)
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9 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec89c3bc454d209007c2b29baeeb3b0.png)
的部分图象如图所示,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec89c3bc454d209007c2b29baeeb3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1028bbe072e5990baab636074949b4bb.png)
A.函数![]() ![]() |
B.函数![]() ![]() |
C.函数![]() ![]() |
D.该图象先向右平移![]() ![]() |
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解题方法
10 . 下列函数中,既是偶函数又在
上单调递增的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8938db94f49dcbe0c383fba0241bb0da.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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