根据下列条件,判断
有没有解?若有解,判断解的个数.
(1)
,
,
;
(2)
,
,
;
(3)
,
,
;
(4)
,
,
;
(5)
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc4f7ae63e7f73ea4f264b12161713.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b5ec4ea2c6751adfd8ebca84d65338.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0fe80d3539d84b821d8955a5b1a2b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1200edb2132ea2784da6fe9864d0a73c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f999e5bc95d23953f2f24a15bcc172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1200edb2132ea2784da6fe9864d0a73c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a6fac2e71a84da2ccd4c383342a496c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1466856bf2570685d3629c1f813748.png)
22-23高一下·全国·课后作业 查看更多[3]
人教B版(2019) 必修第四册 北京名校同步练习册 第九章 解三角形 9.1 正弦定理与余弦定理 9.1.1 正弦定理(二)(已下线)考点巩固卷11 解三角形(九大考点)(已下线)6.4.3 第2课时 正弦定理【第一练】“上好三节课,做好三套题“高中数学素养晋级之路
更新时间:2023-06-05 13:23:53
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解答题-问答题
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名校
解题方法
【推荐1】已知
的内角
的对边分别为
,且满足
.
(1)求B的大小;
(2)若
是
的中线,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef41e42e4337a76501b950786a17641d.png)
(1)求B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045f27376ff260c7da3514b6a96412f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
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【推荐2】在
中,内角
、
、
的对边分别为
、
、
,且
,
.
(1)若
,求
;
(2)若
,解这个三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/6129fbf40a950fc8c516f0abaab21957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09921d9904335a83078262ce62a473.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058958067e67058f3342b26b2406f832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3578b63c5903089595bf324c809a997c.png)
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【推荐1】在△ABC中,c=
,C=
,a=2,求A,B,b.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
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【推荐2】下列三角形是否有解?有解的作出解答.
(1)
;
(2)
;
(3)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0c9e575b7b241e40712152e1279e70.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe3154fbe6813ac2d12b91c9679095df.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d1803c6e2a0de1959b3378bea4536fa.png)
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