1 . 已知
的内角
的对边分别为
为
的中点.
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048e752b1bffcb2c3c2d80efc511c92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4897c5582631dd669700047e178a1005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b85b4d210cb1f3c81da48534ff0d41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() ![]() | B.![]() | C.![]() | D.1或4 |
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2 . 设点
,若直线
与圆
交于
两点,且
,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bec550c01b4f075f22ab67f5e55ed5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7376e015d8782c7acad41d46b6773c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79382ba44ba669b5d43fdd5427adf16c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b346dd08a7cce7f590c4ad26b547c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0043d442fc7bd9177c2e3716d3d762.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 两个非零向量
、
互相垂直,给出下列各式:
①
;②
;③
;④
;⑤
.
其中正确的式子有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880c690f1ec31490b96be592c2c748b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e332fdb0d734d6f3015f88ce4d8f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef84d275246c94cd7d9c983231210fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7058f4df5f5789ef6d612e0d8b9e23fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4154cb6dff75b54549bfa7c9ca8e48f.png)
其中正确的式子有( )
A.2个 | B.3个 | C.4个 | D.5个 |
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4 . 如图,点
是以
为直径的半圆
上异于
、
的动点,点
与点
在直线
的两侧,且
,
,若
,则
的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d271c60f02292c5164a5dbd2b2777e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778dc9a27129af4dd0f7c39fe2aca9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9338b40019b8b73a2ebd332d41861e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7906b66906ec5943b3bbd9ce9a47e7.png)
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5 . 已知
外心是点
,且
,则向量
在向量
上的投影向量为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48ebd3dde5ab32d778e947b02f355ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083a20abb668d4c26fe5039bd108b40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89265cbe3abc6b966ce8967fead448b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 .
的角
对应边是 a,b,c ,三角形的重心是 O.已知
.
(1)求 a 的长.
(2)求
的面积.
![](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/7f9fbd659c7e4424a2ea5a20a86c0cf7.png)
(1)求 a 的长.
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
7 . 在
中,
为BC上一点,
是AD的中点,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c9acc8e0a6a969fa8227b84a088338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/550329e53494cbcad81a474778ed3c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
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8 . 已知非零向量
满足
,
(
)的最小值为2,则
的夹角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddfe7860565faf6cbc2c08fb4a0d6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebd9ab255277f190fb3a714f3cdacdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d5e2dfa2d5b134c85995877eff156b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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9 . 已知向量
满足:
为单位向量,且
和
相互垂直,又对任意
不等式
恒成立,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae951e0bb5a2a406f1572fc1e4964265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83c5803cc8c05849028a57c4bd4ee72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a06c8eae3652486cf9e416ce3a8ffc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b8e5990ef4ef314941a3154457a9d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c7f85c530b9913a1b34e12e3bfcf536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd717ccba36f55241094085f04bf30b.png)
A.![]() | B.![]() |
C.当![]() ![]() | D.![]() ![]() |
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解题方法
10 . 赵爽是我国古代数学家、天文学家,大约在公元222年,赵爽为《周髀算经》一书作序时,介绍了 “勾股圆方图”,亦称“赵爽弦图” (以直角三角形的斜边为边得到的正方形). 类比 “赵爽弦图”,构造如图所示的图形,它是由三个全等的三角形与中间的一个小等边三角形拼成的一个大等边三角形,且
,点
在
上,
,点
在
内 (含边界)一点,若
,则
的最大值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7651ee0f30f2315efe8cdff03663c1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b0b2d4c637db281c26cdf8a8818fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8f8cc7601a01e3d60e4d0f54284e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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