1 . ,现有下列命题:①已知
,
,如果
与
的夹角为锐角,则
的取值范围是
或
;②函数
的图象的对称中心的坐标是
;③在
中,A、B、C所对的边分别为a、b、c若
,则
为等腰三角形;④在
中,A、B、C所对的边分别为a、b、c若
,则
为钝角三角形;⑤在
中,A、B、C所对的边分别为a、b、c若
,则
;其中正确的命题是______________ (请填写相应序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e0946f15d5ebf9df8a388594c3e0c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42d2cf5d22d69cacc5a6c7e85b30165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce31f186f3be3234486a24e133b9100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81ef6d39f2f6734075b3ee48b89b40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf0575c2079d39daf8f3dbd21277a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6980ab948195a337a2fd4cc2cc8f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57067c1145bbe8c6cc231d7e74727032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166f792a201a8ff4a7c73aa5ec3aa026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374b7531bf11005c84bce47d8d6d4c97.png)
您最近一年使用:0次
2 . 数学老师准备命制一道解三角形的练习题,完成了题目部分信息如下:在
中,
、
、
分别是角
、
、
的对边,已知
,
,求边
.显然缺少条件,若他打算补充
的大小,并使得
只有一解,那么
的可能取值是______ .(只需填写一个合适的答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/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/e54a36173cd9b7b28e91619d715cb569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1892446e9f5c057a6d72a64065d01ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
3 . 张老师整理旧资料时发现一题部分字迹模糊不清,只能看到:在
中,a,b,c分别是角A,B,C的对边,已知
,
,求边c,显然缺少条件,若他打算补充a的大小,并使得c只有一解,a的可能取值是______
只需填写一个适合的答案
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60de99e211b7c60ef4ebce335e606536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7da372d55602bd7216b8e7cdedad265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
您最近一年使用:0次
2019-11-12更新
|
336次组卷
|
3卷引用:2019年上海市宝山区高三上学期期末教学质量监测(一模)数学试题
4 . 从下列四个条件①
;②
;③
;④
中选出三个条件,能使满足所选条件的
存在且唯一,你选择的三个条件是____ (填写相应的序号),所选三个条件下的
的值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61676d5ede7f4b50e93be03ecdcedd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18617ef38a8df95ff3d66fa811fd56c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34db466a752f74c6002ac7a4d3f0114d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8653af649d2a1b22f50c8529ef43136d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
2020-06-22更新
|
973次组卷
|
5卷引用:北京市东城区2020届高三第二学期二模考试数学试题
北京市东城区2020届高三第二学期二模考试数学试题(已下线)专题6.5 平面向量单元测试卷(测)-2021年新高考数学一轮复习讲练测(已下线)专题6.6 第六章《平面向量》综合测试卷(A卷基础篇)-2020-2021学年高一数学必修第二册同步单元AB卷(新教材人教A版,浙江专用)吉林省长春市第二实验中学“BEST合作体”2020-2021学年高一下学期期末考试数学试题(已下线)模块四 三角函数、平面向量与解三角形-1
名校
5 . 已知
中,角
、
、
所对的边分别是
、
、
且
,
,有以下四个命题:
①
的面积的最大值为40;
②满足条件的
不可能是直角三角形;
③当
时,
的周长为15;
④当
时,若
为
的内心,则
的面积为
.
其中正确命题有__________ (填写出所有正确命题的番号).
![](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/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df6bb52902ef2cb7ba7ef1a681cdb1a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
②满足条件的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b9446d7b31f0d6e044cf99deeb20aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b9446d7b31f0d6e044cf99deeb20aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
其中正确命题有
您最近一年使用:0次
2018-03-29更新
|
1328次组卷
|
4卷引用:四川省德阳市2018届高三二诊考试理科数学试题
解题方法
6 . 已知下列命题:
①命题:“
,
”的否定是:“
,
”;
②若
,则
,
;
③若
,则
,
;
④等差数列
的前
项和为
,若
,则
;
⑤在
中,若
,则
.
其中真命题是____ .(只填写序号)
①命题:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb49f7407b400d314e55972e4376711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c2b06591c1ec3fdea6cb1bfe3d6bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d374ca687bd81e60d70bf24c99fb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a51e986a81ffb19d2fd7a5ac63e251.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b586d5da50edf2b5d624b1f3368570eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d88a41a8c39757a1bbcc8ae9052c67.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81a37e05f73b403777cb6efdb2ca3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a28e0ab7243fc8133982902400c531f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d6cd6c41f47a05d68ba4c933dd1761.png)
④等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0abedd59476f8793d5a8948590a70c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa74fabc4dc46818ac65272d7a7db33d.png)
⑤在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca51be437b1a97ca92aa1159ab71102c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
其中真命题是
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名校
7 . 以下说法正确的是_______ .(填写所有正确的序号)
①若两非零向量
,若
,则
的夹角为锐角;
②若
,则
,反之也对;
③在
中,若
,则
,反之也对;
④在锐角
中,若
,则
①若两非零向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbc0945b4e1962e66f6f7e7f6af235d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2cc1f1ef9ad32eef62aefa4c3fc3d6b.png)
③在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19dc38d888741a1b2e95fe0773a48c38.png)
④在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79fba1cd42684bd8978cede10fb311e1.png)
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名校
8 .
的内角
,
,
所对的边分别为
,
,
.已知
,且
,有下列结论:
①
;
②
;
③
,
时,
的面积为
;
④当
时,
为钝角三角形.
其中正确的是__________ .(填写所有正确结论的编号)
![](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/90929097f9e4ec1b521a224aaa485d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585d85a95ae83e6b7e4556eb63f3eeb6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18dccba7bc301e4913b1a4856afae466.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d697d914ec99d6edb5a6ab7efe1c5686.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15a13b4190ac3d5feaee27a4c97b21b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be706891a18cdd3ae6d514d34990b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530be0354ac54e554421d9c82e5070e4.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58303bdbbdf9b78308135ee1ed413d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
其中正确的是
您最近一年使用:0次
2017-12-05更新
|
1407次组卷
|
6卷引用:广西贺州市桂梧高中2018届高三上学期第四次联考数学(理)试题
解题方法
9 . 设
的内角
,
,
所对的边分别为
,
,
,则下列命题正确的是______(填写所有正确命题的序号)
①若
,则
;
②若
,则
;
③若
,则
为锐角三角形;
④若
,则
.
![](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)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a45ecd3fe786bc5ccd6e670a6082f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d9793400633975e41fadf5e008c20d.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8207ff1e1605cd98d48489bedd2a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d2e239e8c943d49608d305f17ea5ed.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d913f37ddb7569c3de5078a3c20df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e601172d1fddc55e3e3886487b5bba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c31b95c668a5bcc8c93479405ca6f0f.png)
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10 . 台球是一项国际上广泛流行的高雅室内体育运动,也叫桌球(中国粤港澳地区的叫法)、撞球(中国台湾地区的叫法),控制撞球点、球的旋转等控制母球走位是击球的一项重要技术,在一次台球技术表演节目中,在台球桌上,画出如图正方形
,在点E,F处各放一个目标球,表演者先将母球放在点A处,通过击打母球,使其依次撞击点E,F处的目标球,最后停在点C处,若
,
,
,
,则该正方形的边长为___________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd030af47773a69c4007119bedcbe3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54ecf41f700a59d53dac8cf9358d0cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac06063d089c271ab29873f99418952e.png)
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