在四边形
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/506cb6f0-9b33-4a3c-9bfb-80c5a1df125d.png?resizew=157)
(1)求
的大小;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7d2df86ee897fffd62a719d889d791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb3bc9b8429f56268fb0fd0989ef6c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee66d4667c62551ce2e6250a9612864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/506cb6f0-9b33-4a3c-9bfb-80c5a1df125d.png?resizew=157)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2019-06-14 14:46:34
|
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解答题-问答题
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较易
(0.85)
【推荐1】(1)在
中,已知
,
,
,解这个三角形(角度精确到
,边长精确到
);
(2)在
中,已知
,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263a592442ba4c97ad21d02216e720a8.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e38f550e95b2950f91e8ec1798b94109.png)
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解题方法
【推荐2】如图,在
中,
是
上的点,
,再从条件①、条件②这两个条件中选择一个作为已知,求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/6593be27-ee7a-4be2-807a-413f5532f7a2.png?resizew=209)
(1)角
的大小;
(2)
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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ad2fe3c7a48ea0cf8fdffa47261032.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/6593be27-ee7a-4be2-807a-413f5532f7a2.png?resizew=209)
(1)角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7650cede07c4758a9b3bb1da4553acc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
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解答题-问答题
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较易
(0.85)
解题方法
【推荐1】记
的内角A,B,C的对边分别为a,b,c,
.
(1)求B;
(2)若
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,求c.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e5387867c44fd8b2add4443c51f623.png)
(1)求B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8653af649d2a1b22f50c8529ef43136d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
您最近一年使用:0次
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(0.85)
名校
解题方法
【推荐2】在
中,角
的对边分别为
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,
边上中线
的长为
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(1)求角
和角
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(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01961669cd597f61fa48e9853d678bb8.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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