1 . 已知向量
,
.令
,
(1)求
的最小正周期;
(2)当
时,求
的最小值以及取得最小值时
的值.
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484799176704/1572484804673536/STEM/0a5fa9dcfcc14869a4955bb115df6268.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484799176704/1572484804673536/STEM/2a028b3c028a40969baf15f2a9c54fb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848fe9b1861c19473ef5664d1b8b5d15.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484799176704/1572484804673536/STEM/b3b0d43612a64eed9580a1d48a1a9342.png)
(2)当
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484799176704/1572484804673536/STEM/fb9094939bb04786ba906306b28138d9.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484799176704/1572484804673536/STEM/b3b0d43612a64eed9580a1d48a1a9342.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484799176704/1572484804673536/STEM/893c0beece834faabc0e0dd856f98f01.png)
您最近一年使用:0次
2012·河南焦作·一模
2 . 在公比为
的等比数列
中,
与
的等差中项是
.
![](https://img.xkw.com/dksih/QBM/2013/5/31/1571236561756160/1571236567171072/STEM/bf6d39d117af47bd859903b778cf5097.png)
(Ⅰ)求
的值;
(Ⅱ)若函数
,
,的一部分图像如图所示,
,
为图像上的两点,设
,其中
与坐标原点
重合,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa37aefb6d45efe4e20ba48c2e7dfa8.png)
![](https://img.xkw.com/dksih/QBM/2013/5/31/1571236561756160/1571236567171072/STEM/bf6d39d117af47bd859903b778cf5097.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/351e63588265c780a69d89dc9893fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4492fd2ea041ca877fea1bf3680e23e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d159b6c3d29e6ce9e5d6a6d1e5cda79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b373510103326bc5a0707fc5f43459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d5e5b89f4fc992388b29c64421761ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2013/5/31/1571236561756160/1571236567171072/STEM/aab3fbbae68645f6a20d24eaabb99373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70d41ecda20ebbe2a8d654cda1cce15.png)
您最近一年使用:0次
2016-12-04更新
|
982次组卷
|
3卷引用:2016届江西师大附中高三上学期期末理科数学试卷
3 . 已知函数
的部分图象如图所示.
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/1725def27f3b478db9abbb28a2e0003e.png)
(1)求函数
的解析式,并写出
的单调递减区间;
(2)已知
的内角分别是A,B,C,角A为锐角,
的值.
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/3a7c5cc3ef8f4ecbaacc0850205b995c.png)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/1725def27f3b478db9abbb28a2e0003e.png)
(1)求函数
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/bbca94deba9d4b149f915cb9960c700d.png)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/bbca94deba9d4b149f915cb9960c700d.png)
(2)已知
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/d39507655def428795501bdce144bf6d.png)
![](https://img.xkw.com/dksih/QBM/2016/2/15/1572475946565632/1572475952504832/STEM/62a18bc3fb9d4fd994e4f6cbe4dfc0aa.png)
您最近一年使用:0次