1 . 已知
为锐角三角形,
,
,
.则( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891a89afaeeef8a368439d3ceacea7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844b0b77cdb161524e71b903497c055d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86471051bbe29e35c5ef1e3dca10aad.png)
A.![]() | B.![]() |
C.![]() | D.以上三种情况均有可能 |
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2 . 若对任意的
,不等式
恒成立,则实数
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd0f1e3e3b41948f1b3d287c4b0cb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17c1d27421199b5a09c24e95b160a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2018高三·黑龙江·竞赛
3 . 如图,已知矩形ABCD中,AB=2AD,E为边AB的中点,将
沿直线DE翻折成
,若M为线段
的中点,则在
翻折过程中,下列命题正确的是_______ .
(写出所有正确的命题编号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/dd51024e-df37-4400-9906-358ace5de5d2.png?resizew=170)
(1)线段BM的长是定值;(2)存在某个位置,使
;(3)点M的运动轨迹是一个圆;(4)存在某个位置,使
平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd256471351a526d42ade802026d993a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b771a919a059334671b00c678ce0f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
(写出所有正确的命题编号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/dd51024e-df37-4400-9906-358ace5de5d2.png?resizew=170)
(1)线段BM的长是定值;(2)存在某个位置,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31c61494dcd60c6b90793549a6f50b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb92ea8f5a5cebf53a45cde159223388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4e632c0d8d4afd5477673545ba5760.png)
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4 . 在
中,内角
、
、
所对的边分别是
、
、
.若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f774cd650f14c8f6e4fe0c6a432768bb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cb21ae875f36d52d0b6f82b0201d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f774cd650f14c8f6e4fe0c6a432768bb.png)
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5 . 函数
的最小正周期=_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518d04876f7dd843f41d3af354df9a70.png)
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6 . 方程
的解集为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a9609fa1a1b815015f389ddbeeb37a.png)
您最近一年使用:0次
7 . 在
中,
的对边分别为
若
,O为
的外心,点P在
所在平面上,
,且
,则边AC上的高h的最大值是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a36d58c8556de83487ba937429d603cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cacc73833c27176ca3dc8891f23bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814e39e5535db2f51dea0567da11848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a0fdfa9f4b0ba5604d3346934c2d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec2539e99c3f46a4f02d0eade71eee6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知递推式
,
.则通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4944c22733fc47d48a47e0e0b4f6df71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16e2b89fc8afba72cf3020848f1df89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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9 . 若
,
,则下列判断①
,②
,③存在
,使
,④存在
,使
;也存在
,使
中,正确的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6eec7d75a66a4407631f75320bb8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd08434ba3d0a0d162a7ffaf593998a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4118df6374966db0ef68716dfa9a13e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e67796c688457d65ce0af594ca476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ecf39ce99b3fad69512154416deb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4118df6374966db0ef68716dfa9a13e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e67796c688457d65ce0af594ca476b.png)
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10 .
的最大值为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c40e5eb956ab73cedfae4c37d563d9c.png)
A.![]() | B.1 | C.![]() | D.![]() |
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