在
中,角A,B,C所对的边长为a,b,c,
,
.再从条件①、条件②这两个条件中选择一个作为已知,求:
(1)a的值;
(2)
的面积.
条件①:
;条件②:
.
注:如果选择条件①和条件②分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15aa03a938c7d11e862ddd0579077c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
(1)a的值;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9665e8ae18b802d42c8751092b06d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
注:如果选择条件①和条件②分别解答,按第一个解答计分.
2022·陕西西安·一模 查看更多[2]
更新时间:2022-03-10 08:01:20
|
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,
,
所对边的长分别为
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,满足___________.
从①
,②
这两个条件中任选一个,补充在上面问题中并作答.
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从①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db713d023caf003e3805e42e0597fd95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762a3999109df87568658edc8eed7d08.png)
(1)求
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【推荐2】在
中,角A,B,C的对边分别为a,b,c,
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(1)若
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解题方法
【推荐1】在
中,a,b,c分别为内角A,B,C所对的边,且2c-
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.
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(1)若c=
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(2)若
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解题方法
【推荐2】如图,在平面四边形
中,
为
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,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/2047f3d0-5fcf-4ad6-8c27-dd18dd345c1e.png?resizew=135)
(1)求
的值及
的长;
(2)求四边形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9536a2be7b84612f45cc875a00c5a5d0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f3f523b89df67320b83ce86d4fc85b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
【推荐1】在
中,
分别是角
的对边.若
,再从条件①与②中选择一个作为已知,完成以下问题:
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的值;
(2)求角A的大小及
的面积.
条件①:
;条件②:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3174e1a9fa38c55d295c1c8346a65b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68661072ed7138852fd9936fe9f93b1e.png)
(2)求角A的大小及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf537bfe40ee5fa1f587be3be44e2297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f43f809b79b92effa1f02c0c31b85e.png)
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解题方法
【推荐2】在①
是
边上的高,且
,②
平分
,且
,③
是
边上的中线,且
这三个条件中任选一个,补充在下面的问题中,并求出边
的长.
问题:在锐角
中,已知
,
,
是边
上一点,_____,求边
的长.
注:如果选择多个条件分别解答,按第一个解答计分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
问题:在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
注:如果选择多个条件分别解答,按第一个解答计分
您最近一年使用:0次
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【推荐1】在
中,
.
(1)若
,求
的最大值;
(2)若
,
,
,
为垂足,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1dd07c0571772e96d318f974724810.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de43653bf8568b5b8c880f9415248d9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e3d87be9f706832ef25537d78a201b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
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适中
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【推荐2】在
中,角
的对边分别是
,且向量
和向量
互相垂直.
(1)求角
的大小;
(2)若
外接圆的半径是1,面积是
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)求角
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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