1 . 已知向量
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4565bd58e94e7f436331e22bc54bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf21fef3026cfe445a855c94cab5c84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ec7c99202b44d5d65239f65f155b6f.png)
A.![]() | B.2 | C.![]() | D.-2 |
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2 . 已知角
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09dbdac357e6f3a4eb0c9999b4a410b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83ec8858faeba02c1b7c6e1978b3558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09dbdac357e6f3a4eb0c9999b4a410b.png)
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3 . 已知
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7f71b5f8487992e601056e523af602.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 已知
,
.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc282dae4ac9132196ac5d13f63b901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c709639fc925bacc84b6650024ad865.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7b915277169254e670ea51b693b9fc.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c8a063c4473659841efca643ae4bc3.png)
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5 . 公元前6世纪,古希腊的毕达哥拉斯学派通过研究正五边形和正十边形,发现了黄金分割值约为0.618,这一数值(记为m)也可以表示为
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17fd15c961064204ae42509b4686e95b.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8210744a62fc4cbe44921712064557e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49eb6bedcfb4324c4e7116f56b7f060f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17fd15c961064204ae42509b4686e95b.png)
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6 . 如图,在平行四边形
中,
为边
上异于端点的一点,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e484ff330cc9ae03d5e1f092ac58902c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c070944068d8c47f501d9555462cf87d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9518ccb86c86a9352035523578419116.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 已知
中,角
所对的边分别是
,其中,
.
(1)求
的外接圆半径;
(2)求
周长的最大值.
![](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/f4c0af3ea3185d0e1131f8824b1d356d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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8 . 已知
是第三象限的角,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e08aae9483bb217cbe41c10e00768c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead6131bc303d8a5550b3b1ff48b2acc.png)
A.![]() | B.![]() | C.![]() | D.7 |
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9 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd66c096c47b270cd947e7340a0c247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78dddfb56d88456f43aa622c1620a525.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知
为锐角,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f09ba010d85db5f43c46d9206179f160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75afceb135e4ac785f39844702563f32.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次