名校
解题方法
1 . 在△ABC中,若
,则∠A的大小是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd03342d677149f0dc5204cc577da1e.png)
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名校
解题方法
2 .
的内角
、
、
的对边分别为
、
、
,若
,
,
成等比数列,且
,则
的值为( )
![](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/79b01adc561735ff5be9bb97266918f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18af922d7bcd7a1bfbd89398d86eda5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246fced9d575d5678871d1fb5d4b7010.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 如图,一束光线从扇形OAB的弧
上的C点出发,经该扇形半径两次反射用时
后第一次回到C点.已知
,如果光源C沿
顺时针移动
后到达
点,那么光线从
出发再经该扇形半径两次反射后第一次回到
所用的时间为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/a4c5a438-d320-49a7-8c69-27c1f6c3a499.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e100b6532dbfa8636248a5875522ca0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbd85df5e0bdd6e81d2d8817594d805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/a4c5a438-d320-49a7-8c69-27c1f6c3a499.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 在
中,角A、B、C所对的边分别为a、b、c,其外接圆的半径
,且
的面积
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e159fa38488741d395ea9cb03386b1ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97de2e90bb2bccefe5039c193429cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35853140043c2ce0c680fe9c3a2dca.png)
A.8 | B.4 | C.![]() | D.![]() |
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解题方法
5 . 在
中,角A、B、C所对的边分别为a、b、c,其外接圆的半径
,且
的面积
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e159fa38488741d395ea9cb03386b1ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97de2e90bb2bccefe5039c193429cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35853140043c2ce0c680fe9c3a2dca.png)
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解题方法
6 . 在
中,角
所对的边长分别为
,且
.
(1)求角C的大小;
(2)若
,c=4,求
的周长.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a05417d01620ab316603310b8e2c6590.png)
(1)求角C的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50cd9140b9c493ca5910b6a362fce34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2022-07-02更新
|
412次组卷
|
2卷引用:四川省达州市2021-2022学年高一下学期期末数学(文)试题
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解题方法
7 . 下列说法错误的是( )
A.命题“![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.在![]() ![]() ![]() |
D.“若![]() ![]() |
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2022-07-02更新
|
564次组卷
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3卷引用:四川省成都市第七中学2021-2022学年高二下学期零诊模拟数学(理)试题
解题方法
8 . 在
中,三个内角
,
,
对应的边分别为
,
,
,已知
的面积为
,则
的最小值为______ .
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8a73b71d2261cbc025983a5a3f448f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
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解题方法
9 . 在
中,三个内角
对应的边分别为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
______ .
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcb4bd8be97c3cf4159a2082e9afb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58134656efbffad5eb030e5253667ee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
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2022-06-25更新
|
564次组卷
|
3卷引用:四川省成都市蓉城高中教育联盟2021-2022学年高二下学期期末联考数学(文)试题
名校
解题方法
10 . 设
分别为
三个内角
的对边,已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a9d11c1fdda8f3bb2ef921bc75f816.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](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/8a5979746c6848b468b6e17163f3b2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a9d11c1fdda8f3bb2ef921bc75f816.png)
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2022-10-28更新
|
478次组卷
|
6卷引用:四川省内江市第六中学2022-2023学年高三上学期入学考试数学(文科)试题