已知△ABC的三个角
所对边分别为a,b,c.
,
,
.
(Ⅰ)求
;
(Ⅱ)求
的长及△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c1e84aaa7e1b5c1283075b36c72fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb872102275049c7643352b8fe8350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21143d45f8a1eec5a18f3b82c78ac217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554165bc8be9bf5d2b1d6092bbd159b3.png)
更新时间:2018-07-25 07:51:43
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,
,
,若点
分别为
上的点,且
为等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/b1e15c51-25b8-4f55-b65b-5050fe2d8358.png?resizew=134)
(1)若点
为线段
中点,求
的边长;
(2)若点
为线段
上一动点,求
面积的取值范围.(提示:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350d9f16e66c2bf7e8e3c7dd6418e639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9913530cd12116a0dab253ebf9d935de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5b88ec996d2d117987e7303cefe4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4a91526aaa01560e47867b3bd9f9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/b1e15c51-25b8-4f55-b65b-5050fe2d8358.png?resizew=134)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bfb682867fa062b43dd793da041c56.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】设函数
的图象过点
.
(1)求
的解析式;
(2)已知
,求
的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c3cf79d07ec144643c9e9973c1f5657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8612fd4d53e48793b1fcb43a2d0592c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639d3c911c1b956d8fc787eaf1e925c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17add37f2cc0bd11b96464a542ca4551.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
【推荐1】在
中,角
,
,
所对的边分别为
,
,
,且
.
(Ⅰ)求角
的大小;
(Ⅱ)已知
,
的面积为
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e48cffb75932dcc5dffae68e4800f8.png)
(Ⅰ)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(Ⅱ)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,正在海上A处执行任务的渔政船甲和在B处执行任务的渔政船乙,同时收到同一片海域上一艘渔船丙的求救信号,此时渔船丙在渔政船甲的南偏东40°方向距渔政船甲70km的C处,渔政船乙在渔政船甲的南偏西20°方向的B处,两艘渔政船协调后立即让渔政船甲向渔船丙所在的位置C处沿直线AC航行前去救援,渔政船乙仍留在B处执行任务,渔政船甲航行30km到达D处时,收到新的指令另有重要任务必须执行,于是立即通知在B处执行任务的渔政船乙前去救援渔船丙(渔政船乙沿直线BC航行前去救援渔船丙),此时B、D两处相距42km,问渔政船乙要航行多少距离才能到达渔船丙所在的位置C处实施营救.
![](https://img.xkw.com/dksih/QBM/2011/4/23/1570127651241984/1570127656329216/STEM/02a92d00-4128-449b-ac96-72427002d9e7.png?resizew=204)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在平行四边形
中,
是
的中点,且
在直线
上,且
,记
,
,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/35b566af-14c5-453b-8aad-e24c1e38934f.png?resizew=198)
(1)求
的值;
(2)若
,
,且
,求
.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae003c2f9053fab9bf2365c871fa802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b536ac375a0b74e9c7efbc585f987f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c4abd10ab43ce90743bd0f79b1f5bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061383d76690158d222c8c508b9ec75e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/35b566af-14c5-453b-8aad-e24c1e38934f.png?resizew=198)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5ff78b8a63ab3eaba1985591ab459a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7a42341edbc0b01ab0769c4c02c3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37360e5fa7d235f045ad08eede2aa4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4db1a3b51d12f8863a555ba8d1508e.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
名校
【推荐2】
的内角A、B、C的对边分别为a、b、c,已知
的面积为
,BC的中点为D.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f004f54a065051e6a6d703844aa3e6f8.png)
(Ⅰ) 求的值;
(Ⅱ) 若,
,求AD的长.
您最近一年使用:0次