名校
1 . 张老师整理旧资料时发现一题部分字迹模糊不清,只能看到:在
中,a,b,c分别是角A,B,C的对边,已知
,
,求边c,显然缺少条件,若他打算补充a的大小,并使得c只有一解,a的可能取值是______
只需填写一个适合的答案
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60de99e211b7c60ef4ebce335e606536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7da372d55602bd7216b8e7cdedad265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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2019-11-12更新
|
333次组卷
|
3卷引用:2019年上海市宝山区高三上学期期末教学质量监测(一模)数学试题
2 . 对于数列
,若存在正整数
,对于任意正整数
都有
成立,则称数列
是以
为周期的周期数列.设
,对任意正整数n都有
若数列
是以5为周期的周期数列,则
的值可以是_________ .(只要求填写满足条件的一个m值即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606e55241a2e145d54849129b8ffd20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2b94cbf8f1acc77ed2618d9ba5756a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606e55241a2e145d54849129b8ffd20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57bf94164c6a4430150fc0144d15a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579c216fb015776ed6c4b3e258a1f4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039271f3111b0e21bc1282fcc22cf016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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3 . 某人沿一条折线段组成的小路前进,从
到
,方位角(从正北方向顺时针转到
方向所成的角)是
,距离是3km;从
到
,方位角是110°,距离是3km;从
到
,方位角是140°,距离是(
)km.试画出大致示意图,并计算出从A到D的方位角和距离(结果保留根号).
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/9b3053594d4440bc99d8a135e87a013e.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/3dbcd1def67c4024a59ceffc930ad62f.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/be643ccf4a2a4f90a43e1bf3211836b5.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/118ecef6da504f6da968e97dedadfb2c.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/3dbcd1def67c4024a59ceffc930ad62f.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/3d197c0c2ecc4ba1b50bd341b178c30a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/3d197c0c2ecc4ba1b50bd341b178c30a.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/85577942314a4c93b22a06c4ec9e99bf.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571688545214464/1571688551219200/STEM/b67fcb3c8b484167a4fc5080ff524b83.png?resizew=55)
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2013·上海浦东新·二模
4 . 设函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60637c4a50694a4a4bb1d1723b78e711.png)
(1)当
,画出函数
的图像,并求出函数
的零点;
(2)设
,且对任意
,
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60637c4a50694a4a4bb1d1723b78e711.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e368f1b7109436bb94f40363544ffec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320786c30e758bda019f2f4f88224ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc70276e8bba4f3a519be50442f0f21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030805eebb5ad0a065f93bd6f652f687.png)
![](https://img.xkw.com/dksih/QBM/2013/4/26/1571198516207616/1571198521974784/STEM/b089c79e70b24419aad4e3f69492e8b7.png)
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