名校
1 . 如图,在
中,
,
,
,
是
边上的一点,若
,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a935e55a8fabf4697e3b6561d5701e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12cd088a6f16ee92bb314494426f11c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/bd414946-1743-41f1-976f-79f7636b5334.png?resizew=193)
您最近一年使用:0次
2017-07-26更新
|
527次组卷
|
2卷引用:【全国市级联考】河南省鹤壁市2017-2018学年高一下学期期末考试数学试题
解题方法
2 . 已知
,向量
,
的夹角为
.
(1)求
,
;
(2)求
与
的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f025220e23b5c35463b234f2abb516ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecce1ed933a1802df36b35805d6a144a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6753f494dbcbc843644eaaac6c17d4.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b98386771bbcbdb72732c37633dff29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713eb2a72f8f690b71f27ec93ff40a34.png)
您最近一年使用:0次