解题方法
1 . 已知圆
,
为圆外一点,过
引圆的切线,两切点分别为
和
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08227ca941898eb34941f446ca8b1de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/1f9de57cc3b964f345594b036da889c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2097c3d86a18ce211d7fcfb395788725.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 正方形
的边长为2,圆
内切于正方形
,
为圆
的一条动直径,点
为正方形
边界上任一点,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3dfef1b5b07e30ee36531e996220df.png)
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2020-03-04更新
|
935次组卷
|
3卷引用:2020届江苏省南京师大附中高三上学期第一次模拟考试(二)数学试题
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3 . 在
中,已知
,则
的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c0b71d203d7b372aae13e2e63d0a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
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2018-05-30更新
|
1746次组卷
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4 . 单位向量
,
为的夹角为
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e59741a90e74386e8617d7f469df1e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2ce03cd099d3d301de3ae40f627313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e888ea14da893971e13858945bf0cd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 已知点P在边长为4的等边三角形ABC内,满足
,且
,延长AP交边BC于点D,若BD=2DC,则
的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e0b71d7b357e8bb49cc3575fdd207b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f224879d451c00bbfecbe286044e9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33e5d0dbdd0f15854f0d7dd8b53058.png)
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2020-06-05更新
|
858次组卷
|
2卷引用:江苏省南京市2020届高三下学期6月第三次模拟考试数学试题
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解题方法
6 . 在菱形
中,
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db826bbd5b4c4fe41a7cf9169d363c85.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55deaf56eefabb84a18805ab11c7872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97afbe643ccc19b51a786f77dc2b585a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34c87f2e8d5dbe8b356b8d6a8c6eb4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db826bbd5b4c4fe41a7cf9169d363c85.png)
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7 . 在
中,内角
所对的边分别为
,且
的面积
满足
.
(1)求角
的值;
(2)若
边上的中线长为
,求
的值.
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e48513589cd23c9c93c0934f4bc587b.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700762875cb4f15b556a72f10a42ac9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2020-08-03更新
|
765次组卷
|
3卷引用:江苏省南通市2020届高三下学期高考考前模拟卷(五)数学试题
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8 . 已知
是
的垂心(三角形三条高所在直线的交点),
,则
的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714079593881de148bd602ad21818c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cb63aeea0b37799404c8fec092b21d.png)
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2020-02-27更新
|
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3卷引用:2020届江苏省盐城市、南京市高三年级第一次模拟数学试题
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解题方法
9 . 如图,△ABC为等边三角形,分别延长BA,CB,AC到点D,E,F,使得AD=BE=CF.若
,且DE=
,则
的值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd93bfb299a5f14fbd3b2eb829bd5f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d47afd60e6c6025fc15281d007518cb.png)
![](https://img.xkw.com/dksih/QBM/2020/6/3/2476517469691904/2477229341646848/STEM/aa5634cc0b194a15b969ccea4e2fb1b7.png?resizew=184)
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2020-06-04更新
|
726次组卷
|
6卷引用:2020届江苏省七市(南通、泰州、扬州、徐州、淮安、连云港、宿迁)高三下学期第三次调研考试数学试题
10 . 已知
与
均为单位向量,若
,则
与
的夹角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfea4095ab74ae6242c147c047f1103c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
A.30° | B.45° | C.60° | D.120° |
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