在
中,有
.
(1)求B;
(2)若
,角B的角平分线BD交AC于D,
,求边AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca56db35ba6aee544a0f672bae36b55.png)
(1)求B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea06c428d3e100b4b6857c20a1699ca.png)
更新时间:2020-05-19 23:07:15
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解答题-问答题
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【推荐1】已知
的内角A,B,C的对边分别为a,b,c,已知
.
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583070738497536/2584324514496512/STEM/e9e1dc98-c08e-4d1d-8fc9-4f9d4b8dfe72.png?resizew=198)
(Ⅰ)求角C;
(Ⅱ)如图,若点D在边
上,
,
,E为垂足,
,
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3224aadf529fd60e69bc8fe292d74450.png)
![](https://img.xkw.com/dksih/QBM/2020/10/31/2583070738497536/2584324514496512/STEM/e9e1dc98-c08e-4d1d-8fc9-4f9d4b8dfe72.png?resizew=198)
(Ⅰ)求角C;
(Ⅱ)如图,若点D在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f855c80172c04310d342f82d960011ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
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【推荐2】已知函数
.
(1)求函数
的最小正周期;
(2)求不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e82270a7c594880f60a45fe64f2d2c.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
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【推荐1】为了测量隧道口
、
间的距离,开车从
点出发,沿正西方向行驶
米到达
点,然后从
点出发,沿正北方向行驶一段路程后到达
点,再从
点出发,沿东南方向行驶400米到达隧道口
点处,测得
间的距离为1000米.
在点
的北偏东
度的方向上,求
的值;
(2)求隧道口
间的距离.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74ab08a7013626d1a7e95ab9ba29f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
(2)求隧道口
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】在①
,②2ccosA=acosB+bcosA,③b2+c2=a2+bc,这三个条件中任选一个,补充在下面问题中,并解决该问题.问题:在△ABC中,内角A,B,C的对边分别是a,b,c,若已知b=6,
,______,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beaa31661f2e8874edb191112dd22384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b25095cacceb6eb38e83f9a2279fe5.png)
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【推荐1】已知
的内角
所对的边分别是
向量
,
,且
.
(1)求角A;
(2)若
,
的面积为
,求b、c.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f440564327e87a50cbca7afd5f1734b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4871afdabc74532feeef442d7117c57d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad24c7b9401b4fbd8ff2588b1bb77651.png)
(1)求角A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa79a550591eb9e1bd07bced3a08fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
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【推荐2】在
中,已知
,
,
,解这个三角形(角度精确到
,边长精确到0.1cm);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5119262ff121a9874329060c36b9fd5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a456a15be5cda146bfbb763c72c6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be03f5883976479e123ea1d02ef56f90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c74a88e12936aaa3518764d5fb5192.png)
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