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1 . 从长度为3,4,5,a的4条线段中任取3条,这3条线段能构成锐角三角形的概率为
,则实数a的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解题方法
2 . 在
中,角A,B,C所对的边分别是a,b,c,已知
.
(1)求角C的值;
(2)若
,点D在边
上,
为
的平分线,
的面积为
,求边长a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690e3a7140ea133626ddfdf313bf0598.png)
(1)求角C的值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f15ba851a0f65c271ec774095516f07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
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3 . 在①
,②
,③
,这三个条件中任选一个,补充在下列的问题中,并解决问题.
的内角A、B、C的对边分别为
、
、
,已知____________.
(1)求B;
(2)若
的外接圆半径为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a04e4c8a704fac8a9da24e70a3a474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5bbec22aa4a92538aa16584fee7714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d04999c0a837f7955eef9f85e1da9cb.png)
![](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)
(1)求B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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2022-06-06更新
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3卷引用:福建省泉州第五中学2021-2022学年高一下学期期中考试数学试题
福建省泉州第五中学2021-2022学年高一下学期期中考试数学试题吉林省长春市第二实验中学2022-2023学年高一下学期4月月考数学试题(已下线)高一下学期期中数学考试模拟卷01-2022-2023学年高一数学下学期期中期末考点大串讲(人教A版2019必修第二册)
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解题方法
4 . 已知在
中,
,
,
,点D,E分别为线段AC,AB上的动点,若
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2159a60506c83de4834adea5b97d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724bcf18ef47c962a297640bf7afd5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88edded8d975421a6575bb572b594824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-05-29更新
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2卷引用:福建省福州格致中学2021-2022学年高一下学期期末考试数学试题
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5 . 如图所示,在等腰直角
中,
,O为
中点,E,F分别是线段
,
上的动点,且
.当
时,则
的值为______ ;
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badd7f8d19336d05e5bbd72ce46464c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93fa9148757b8e605c6288a5b7945099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d350a8988d598259cb85f6bab4001f44.png)
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982159701016576/2982913303896064/STEM/d986d7699b574d6d8805249e0c6288f6.png?resizew=237)
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2022-05-19更新
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5卷引用:福建省龙岩市上杭县第二中学2021-2022学年高一下学期5月月考数学试题
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6 . 在
中,a,b,c分别为内角A,B,C的对边,下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() |
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7 .
的内角A,B,C的对边分别为a,b,c,若
,
,那么
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9665e8ae18b802d42c8751092b06d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 在
中,
,
,
,
为
所在平面内的一点,
,则
的值可能为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5656661f1d7fd5b403d1dd39d1adfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43abdfba44c0d7f10357f47f02506772.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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9 . 对于
,有如下命题,其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() ![]() |
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|
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解题方法
10 . 从①
;②
;这两个条件中选择一个,补充在下面试题的横线上,并完成试题解答.
设
的内角A,B,C的对边分别为a,b,c,已知
的面积为
,且_______.
(1)求B
(2)若
,求
的最小值,并判断此时
的形状.
(注:若选择多个条件分别作答,则按第一个条件计分)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4dab9c032b7eb5e8f7d01bfe788c578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdd31043c300b09b096b518729cb7e7.png)
设
![](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/edb57d84f9bbcb3e30d4ce7e2e1e8604.png)
(1)求B
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7735eeeba8e3fe00e3fb401ffe449ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(注:若选择多个条件分别作答,则按第一个条件计分)
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2022-05-14更新
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