1 . (1)在
中,若
,则
一定是__________ 三角形
请填写锐角,直角,或钝角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f774cd650f14c8f6e4fe0c6a432768bb.png)
_________ .
(3)已知复数z满足
,则
的最小值是________ .
(4)如图所示,空间四边形ABCD中,两条对边
,
分别是另外两条对边
上的点,且
,则异面直线AB和CD所成角的大小为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ee200d87dc576c5259be96bc0431c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a301324443eb93b467134a86890dd9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc56eba6d1e1c9d293d648a756de4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f774cd650f14c8f6e4fe0c6a432768bb.png)
(3)已知复数z满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839ba7c0f1fc30151d18a2e337951dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf22958b9d397bce8d3b950c8fefbae8.png)
(4)如图所示,空间四边形ABCD中,两条对边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e0f9d0d28bfb81ad132e0064402573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65367e9651ecd42fce6a7ae585a5d4a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/fb8817ed-8550-418d-a744-bf78d0539598.png?resizew=167)
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2 . 已知函数
的最大值为2.
![](https://img.xkw.com/dksih/QBM/2022/2/21/2921244669149184/2929085287563264/STEM/c8f20121-4e01-4d34-af09-e0efc39217c5.png?resizew=232)
(1)求a的值及
的最小正周期:
(2)画出
在
上的图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa7d65944388776d8c537d987fb9950.png)
![](https://img.xkw.com/dksih/QBM/2022/2/21/2921244669149184/2929085287563264/STEM/c8f20121-4e01-4d34-af09-e0efc39217c5.png?resizew=232)
(1)求a的值及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3aae9c8988f4a48db69cad3308942c9.png)
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