20-21高一·全国·课后作业
1 . 已知钝角三角形ABC的三边长为连续的自然数,求三边的长.
您最近一年使用:0次
20-21高一·全国·课后作业
2 . 在△ABC中
(1)已知b=8, c=3, A=60°,求a;
(2)已知a=2, b=
, c=
+1,求A.
(1)已知b=8, c=3, A=60°,求a;
(2)已知a=2, b=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
您最近一年使用:0次
3 . 在△
中,已知
,
,
.建立如图所示的平面直角坐标系,利用两点间的距离公式计算
,并由此证明余弦定理.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5993215cfc7cfdec291c76e76639f53.png)
您最近一年使用:0次
20-21高一·全国·课后作业
解题方法
4 . 在△
中,已知
,
,且a,b是方程
的两个根,
,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c56f36788cdd0738735e2c2ddfc7289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b903021571c1b57943a1a3274217654.png)
您最近一年使用:0次
20-21高一·全国·课后作业
解题方法
5 . 在△
中,已知
,求A的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88008ddfb39b35dde4f2da2e0bf1c9da.png)
您最近一年使用:0次
20-21高一·全国·课后作业
解题方法
6 . 用余弦定理证明:在△
中.
(1)
;
(2)
;
(3)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63471f592531e46277365ed319e2acc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17f388fec2cc99288248801962c266b.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ce2f54d69a5987c1de19da53342811.png)
您最近一年使用:0次
20-21高一·全国·课后作业
解题方法
7 . 在△
中,已知
,试判断△
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca84eed7b66bb74a9b4c448d5853b6b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
8 . 在
中,已知
,
,
,求平行四边形两条对角线的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2732c063f01d83e8f7cfc2b138732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1466856bf2570685d3629c1f813748.png)
您最近一年使用:0次
9 . 在
中,
(1)已知
,
,
,求c,B;
(2)已知
,
,
,求a,C;
(3)已知
,
,
,求最小的内角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aecf45db54a4c7c4b9271a4895f0715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051e0b4c98d306075d7c8533691c370b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008cc286d768a3c1f05da13826aed4f9.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d39e8c6fc9149d6290c493a65bdc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399770530966be15114a1fae1aa74fa1.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68abf671ba1bc7cbf2704f1dfde481d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf4c55e68427cca325cfbddedcf84eb.png)
您最近一年使用:0次
20-21高一·全国·课后作业
10 . 在△
中,已知
,
,
,求证:△
为锐角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b903021571c1b57943a1a3274217654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次