在锐角△ABC中,角A,B,C所对的边分别为a,b,c,
.
(1)求角B的大小;
(2)设向量
,试求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c34d07a3d2d08fcbdd5a2ac8b39dcc0.png)
(1)求角B的大小;
(2)设向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387c4c02f4ca213119253053fb2a76a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741574f71252839af5c088cf224bf159.png)
更新时间:2021-07-25 21:49:00
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【推荐1】在四边形
中,
,
,
,
.
(Ⅰ)求
;
(Ⅱ)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ff6d7dd48b57f03d82d2c522ee9b94.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7385a7caee96f0030f1760f70e1150e4.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9b95d703163eac1f07410045600066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】
的内角A,B,C的对边分别为a,b,c,已知
.
(Ⅰ)若
,求
的值;
(Ⅱ)若
,证明
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e27871c56de9bc9ea4ec74276a96f29.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e3bde0b3bf618ceed29dc18a6a4555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942245aece46d6fa4a771afe4ff05929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6208cbf9f9ca96d25ac39d654553764.png)
(1)若
,求
的值;
(2)若
,求向量
在向量
上的投影向量的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774909e062a8c06f4f6ba5c042714863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6208cbf9f9ca96d25ac39d654553764.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b958a367fa2f08b6202a5a6ebf5e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c614d6e051a673022d30c281cdec20c2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b12fe9a4054ffbacca1b995751969a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
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【推荐2】如图,在边长为2的正方形ABCD中,以A为圆心,AB为半径作扇形ABD,P是弧BD上的一个动点,可设
,过P作
于E,过P作
于F,令
,
.
(1)用
表示
和
,并求
的取值范围;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513cb0e220a0fed33454151e303bcbe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccbaa2ea963948e36c6cac3d84c548a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a760ae07c18788287b9e58b29b85fc54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8008e097fd8e5a5c75c1001c44e3878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590fa5b5ec83b648596fabe8168b4131.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/84845630-faaf-4722-bbff-c8c16f56d15b.png?resizew=130)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adebff9fb726cd58eda1ef994890901.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac9a6fdb8656108c2d3d3850a2203c4.png)
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【推荐3】已知向量
,
.
(1)若
,求
的值;
(2)若
,求实数k的值;
(3)若
与
的夹角是锐角,求实数k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39a89c771da94657b6f910ef265664f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e823d0f08c72251f8d3112fa387185.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03481e6a73207be03fdbc1f8e9965b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7d8b42c85013ba07ba18e5e46d8716.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea21c77297a4d026bf11f8cb79c9b51.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
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您最近一年使用:0次
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解题方法
【推荐2】已知函数
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(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23aaf2f84c3ec11a3f93a2b51aac0d54.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cadd04e37b0f8d97f3fbad69e9c93323.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a565b2717af60e0430905e16bbdc6cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88160e61502642ba3ed0637ec11fb65d.png)
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