名校
1 . 如图,扇形
所在圆的半径为2,它所对的圆心角为
,
为弧
的中点,动点
,
分别在线段
,
上运动,且总有
,设
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/acd803c8-04ea-4926-8d97-7bc5379d9123.png?resizew=138)
(1)若
,用
,
表示
,
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e20d6fe4fea186b697f6456cb7c6ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91a9cb32a25c2a8bb99f75633b4cd5ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049131856ba841523793ee3d83099014.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/acd803c8-04ea-4926-8d97-7bc5379d9123.png?resizew=138)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c11a7ce3d62a7c0ddcb8397ecec00d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754ff99a252a251da4b9b3db4912f57d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c114400276606307388adbd66f4cb3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de88a91424dad8dbb931c2278f06598.png)
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2020-03-02更新
|
1014次组卷
|
4卷引用:河南省八市学评2017-2018学年高一下学期第二次测评数学(文)试题
解题方法
2 . 已知
,
,若
与
的夹角为锐角,则
的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddac50ca9d89729c6ac4a5d687bd3b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dee7fd9bb7fff238f4fd52262196921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
3 . 如果向量
与
的夹角为
,那么我们称
为向量
与
的“向量积”,
是一个向量,它的长度
,如果
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b0cb9f6ed923e6c58e8312c96c769e.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/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1674d14213c4d560adf90778bba1825.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/b1674d14213c4d560adf90778bba1825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66558cfadb748daba7767919d335ce87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd88b628fffac73eb6963e0d8e225e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4414868cf52b40a6ce7715727f28b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bad371753f8949c39c318f987d1f7c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b0cb9f6ed923e6c58e8312c96c769e.png)
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