名校
1 . 已知
的内角A,
,
所对的边分别为
,
,
,且
.
(1)证明:
是
,
的等差中项;
(2)求A的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/4ad63abe4af8949dbab8f77643d30fec.png)
(1)证明:
![](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)
(2)求A的最大值.
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2021-04-30更新
|
527次组卷
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2卷引用:黑龙江省实验中学2021-2022学年高三上学期第五次月考数学理科试题
名校
解题方法
2 . 已知
中,
.
(1)
中是否必有一个内角为钝角,说明理由.
(2)若
同时满足下列四个条件中的三个:①
;②
;③
;④
.请证明使得
存在的这三个条件仅有一组,写出这组条件并求出b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/570f4e1a51292d9fe2c89ee23771f92d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a07fcfd5d22629a729e21052aafc2fd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf7e7beb7ca1ffd445c7501bd5e3dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413f9851aad373d782ae62b308f1de85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2021-01-21更新
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699次组卷
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7卷引用:黑龙江省哈尔滨市阿城区第一中学2021-2022学年高一6月月考数学试题
名校
解题方法
3 . 设
分别为
内角
的对边.已知
.
(1)证明:
是直角三角形.
(2)若
是
边上一点,且
,求
的面积.
![](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/e0cfc20818900449524ae947858d12f1.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dfb7add4de41c47d2fe5d38faea09a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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2020-05-09更新
|
512次组卷
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7卷引用:2020届黑龙江省高三5月联考数学(理科)试题
名校
解题方法
4 . 四棱锥
中,底面
为矩形,侧面
底面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573116724396032/1573116730736640/STEM/8eb3c96cf10e45b9a7bc05d9bda93649.png?resizew=160)
(1)证明:
;
(2)设
与平面
所成的角为
,求二面角
的余弦值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573116724396032/1573116730736640/STEM/8eb3c96cf10e45b9a7bc05d9bda93649.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef835f948e9ab2e57b0f34ec7f05213.png)
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2020-10-18更新
|
1339次组卷
|
3卷引用:黑龙江省哈尔滨师范大学青冈实验中学校2018-2019学期高三8月月考数学(理)试题
名校
解题方法
5 . 已知
的内角
,
,
所对的边分别为
,
,
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
只能满足 以下三个条件中的两个:①
;②函数
的部分图象如图所示;③
,
,满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/8b1edb54-b2f0-46a9-b185-d3973d66fb60.png?resizew=201)
(1)请指出
满足哪两个条件,并证明;
(2)若
,点
为线段
上的点,且
,求
面积的最大值.
![](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/f0bf802bd6b0860021b0c18a1099feb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cddf7199359b981a23fa6a456089f83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319ea61f3ba6bdbc0c7ce5e23024484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5341ffb79dc6338f4fcbc5c01aa7283b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a70d446e6fc756806938596817fd1bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/8b1edb54-b2f0-46a9-b185-d3973d66fb60.png?resizew=201)
(1)请指出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9ab8367d0e1b47d5457469d2f0ac83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
您最近一年使用:0次
名校
6 . 在△ABC中,已知sinB=
,
+
=
,
(1)求证:sinAsinC=sin2B
(2)若内角A,B,C的对边分别为a,b,c,求证:0<B≤
;
(3)若
=
,求|
|.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de472c956b281d355e3ebf93bb32839e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0475332e81e437e0d42f0bb75601ca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bee6bdbabc5aef5b9b6e0ed01152d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dfd642cc995fba5891f2c0b7a6dfdf9.png)
(1)求证:sinAsinC=sin2B
(2)若内角A,B,C的对边分别为a,b,c,求证:0<B≤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3903d7253d94c78ad9f0c2a53819c8d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b613aeaad5e41816987367b28d44ab94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103070abee09399f1e9510a75c3ba9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632af94f37c2e44af42e31b3301e03af.png)
您最近一年使用:0次
2018-09-30更新
|
559次组卷
|
2卷引用:【全国百强校】黑龙江省大庆实验中学2019届高三上学期第一次月考数学(文)试题
名校
7 . 已知a,b,c分别为
三个内角A,B,C的对边,S为
的面积,
.
(1)证明:
;
(2)若
,且
为锐角三角形,求S的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251cd3bec5f275a495cee6c62eb28fec.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78235c4d72a343ab223fbf8f8d1cbb99.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189730bce62734abf57f76454e1b70e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
您最近一年使用:0次
2019-02-20更新
|
13422次组卷
|
15卷引用:黑龙江省大庆实验中学2020-2021学年高一数学6月月考试题
黑龙江省大庆实验中学2020-2021学年高一数学6月月考试题黑龙江省哈尔滨市第十一中学校2022-2023学年高一下学期4月月考数学试题江西省南昌市南昌县莲塘第一中学2018-2019学年高一下学期4月月考数学(理)试题江苏省扬州市高邮市第一中学2022-2023学年高三上学期阶段测试一数学试题江西省吉安市泰和中学2022-2023学年高一下学期7月月考数学试题黑龙江省齐齐哈尔市恒昌中学校2022-2023学年高一下学期期中数学试题【全国百强校】辽宁省鞍山市第一中学2019届高三第一次模拟考试数学(理)试题江苏省常州市教学联盟2019-2020学年高一下学期期中数学试题(已下线)考点17 正余弦定理(练习)-2021年高考数学复习一轮复习笔记安徽省合肥市第六中学2020-2021学年高三上学期期中理科数学试题(已下线)必刷卷05-2021年高考数学(文)考前信息必刷卷(新课标卷)(已下线)必刷卷01-2021年高考数学(理)考前信息必刷卷(新课标卷)广东省三校2022-2023学年高一下学期期中联考数学试题广东省广州市铁一中学等三校2022-2023学年高一下学期期中联考数学试题(已下线)专题12 正余弦定理妙解三角形问题和最值问题 (11大核心考点)(讲义)
名校
8 . 如图所示,
中,
.
(1)求证:
是等腰三角形;
(2)求
的值以及
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72890d0f7e0409f5f35b8336964a1281.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2018/1/16/1861522842705920/1862871781982208/STEM/8e8f9d84134a4136b7d887b29a4e74de.png?resizew=289)
您最近一年使用:0次
2018-01-18更新
|
1108次组卷
|
4卷引用:【全国百强校】黑龙江省大庆实验中学2019届高三上学期第一次月考数学(理)试题
名校
9 . 已知
为
的内角
的对边,满足
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe401db356f2d6e9b7adc9a19d8fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b378a2df371f5ff1815c03a84f571229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05c4f2c9e3a68200d84071f8794e152.png)
函数
在区间
上单调递增,在区间
上单调递减.
证明:;
(2)若,证明
为等边三角形.
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名校
解题方法
10 . 在
中,角
对应的边分别是
.求证:
(1)
;
(2)
![](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)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282b7c169fec6596e660bfa69c75677c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d982eefae6000db1244ede983bf31e.png)
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