名校
1 . 在
中,
在边
上,且
平分
,若
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc4d6a2ca3def2f7bbe008daa972336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7f89fd7ddc3277cf27230a12d60f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如图,在平面斜坐标系
中,
,平面上任一点
的斜坐标定义为:若
(
为与
轴、
轴同方向单位向量),则点
的斜坐标为
.若在该斜坐标系中,
,
,则
为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6091495f40b421fde1b167814e6674d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5253a9a71037d60059b60237824193b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10814bc3db929e79874befe96cf4e3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9aa1d34d66a6876aa0566c8fc8b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5685e364dec31be0e5d6973e5b56efcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d23dbda2563059789698f0219387900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f22de2383a103b4481e8b4669caddc4.png)
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3 . 如图所示,已知点
是
的重心,过点
作直线分别交
两边于
两点,且
,
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9545f42dc3bb78dabdb73891f2e4a69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301af152850e2c795bd385d0d10836f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fc838e1477179b36ca7481ee2cc1e8.png)
A.![]() | B.![]() | C.4 | D.2 |
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4 . 下列说法正确的是( )
A.已知![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
B.在![]() ![]() ![]() ![]() ![]() |
C.已知在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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5 . 已知
是虚数单位,复数
,m为实数.
(1)当实数m满足什么条件时,
为纯虚数
(2)若复数
在复平面内对应的点位于实轴负半轴,求复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518911c0598607ef6799bd4265b1b49.png)
(1)当实数m满足什么条件时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
(2)若复数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
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6 . 若复数
满足
(
是虚数单位),则下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1b63802142b90e3353827482ff9bc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() |
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7 . 海岸上建有相距
海里的雷达站C,D,某一时刻接到海上B船因动力故障发出的求救信号后,调配附近的A船紧急前往救援,雷达站测得角度数据为
.
(2)求
之间的距离,并判断若A船以30海里每小时的速度前往B处,能否在3小时内赶到救援(说明理由)?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd1766294dc48dd810a6ab4840703a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914a8b5f26d7ec9a180b1a15f5395a63.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
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8 . 在
中,内角
的对边分别为
,且
.若
,
是边
的中点,且
,则
的内切圆的半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd63101d70caecb820056bf3ea0e76c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d75f67ac92faf413da3cf4aeaab9e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35cbd9bb0385e6384107eb2183a136c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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9 . 已知复数
满足
,则复数
在复平面内对应点的集合所构成的图形面积为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3f7970a806581eab4ea0845903d263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
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10 . 下列命题错误的是( )
A.若向量![]() ![]() ![]() ![]() ![]() ![]() ![]() |
B.在![]() ![]() ![]() ![]() ![]() |
C.已知向量![]() ![]() ![]() ![]() ![]() |
D.平面向量![]() ![]() ![]() ![]() ![]() ![]() |
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