在
中,角A,B,C所对的边分别是a,b,c,若
,
,则
的面积等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f570a35ee91d04ac3587acd8fef3d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2987e5eacd2766e151f4792cd19b2451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.4 | D.![]() |
21-22高二上·福建厦门·开学考试 查看更多[3]
(已下线)福建省厦门第一中学2021-2022学年高二上学期开学考试数学试题安徽省合肥市双凤高级中学2022届高三一模文科数学试题湖北省黄冈市外国语学校2022-2023学年高一下学期(鄂东南省级示范高中教育教学改革联盟学校)期中联考模拟数学试题
更新时间:2021-09-09 21:44:28
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【推荐1】已知
的面积为
,且
,
,
为钝角,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4bb1a5f4321ee77c0af78b9de44b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485f0c8a1cdb3b95d39dd33592110d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2adc87a0201de10b4b785e01da4ddd54.png)
A.![]() | B.4 | C.![]() | D.5 |
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【推荐2】在
ABC中,角A,B,C所对应的边分别为a,b,c.若角A,B,C依次成等差数列,且a=1,b=
,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
A.![]() | B.![]() |
C.![]() | D.2 |
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【推荐1】△ABC的内角A,B,C的对边分别为a,b,c,已知asinA-bsinB=4csinC,cosA=-
,则
=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ecc3aaae2aa289591a3b632f1e0645.png)
A.6 | B.5 | C.4 | D.3 |
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【推荐2】如果把直角三角形的三边都增加同样的长度,则这个新的三角形的形状为( )
A.锐角三角形 | B.直角三角形 |
C.钝角三角形 | D.由增加的长度决定 |
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【推荐1】已知向量
满足
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a0a45b97a782a436fea0b28e45766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/406b5eb37772dba7e4884a6c25a51d1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381ed0018c97b66a45e95a8cff6d4a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ae7b611dcca426419d478870a026d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a0a45b97a782a436fea0b28e45766.png)
A.10 | B.12 | C.14 | D.16 |
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【推荐2】在
中,
,
,
,点
满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c278812c4813f6391c7993574e2f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6623de5abdeae42cb02348563ff103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c7dfd52db64027b6e4df1a1bafa9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d4cedefef1d368cedd8ad5eb512225.png)
A.0 | B.3 | C.6 | D.9 |
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