名校
1 . 如图所示,在
,已知
,角
的平分线
把三角形面积分为
两部分,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8783372eb2cec71edab37661e6806f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1dcdac71e394e495d069f64e1f1ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-08-02更新
|
2695次组卷
|
7卷引用:河北省石家庄实验中学2019-2020学年高一下学期3月月考数学试题
河北省石家庄实验中学2019-2020学年高一下学期3月月考数学试题安徽省芜湖市2018-2019学年高一下学期期末模块考试A卷数学试题广东省郁南县连滩中学2019-2020学年高一下学期5月摸底数学试题(已下线)【新教材精创】9.1.1正弦定理(第1课时)练习(1)河南省郑州市郑州一中2017-2018学期高二数学月考试题(已下线)专题4-2 正余弦定理与解三角形小题归类1-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)(已下线)第11题 定高倍角三角形面积取值问题(压轴小题)
名校
2 . 在锐角
中,内角A,B,C所对的边分别为a,b,c,若
的面积为
,且
,则
的周长的取值范围是________ .
![](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/4d1a9df897f1d5458c96872d354a332d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2019-08-01更新
|
2393次组卷
|
7卷引用:河北省邢台市2018-2019学年高一下学期期末数学试题
3 . 数列
中,
,
,
.
(1)证明:数列
是等比数列.
(2)若
,
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a67c74780b28ec8a02f34da037b058a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1179414a71459a3cfa134ace94302e.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a70f235f35a4023396c73b3f21f6594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338947df86eb08f890be799504afe309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab222272c0464b63967483f8c9befd9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
您最近一年使用:0次
2019-07-18更新
|
562次组卷
|
3卷引用:河北省定州市2018-2019学年高一下学期期末考试数学试题
4 . 已知数列
的前
项和为
,
,且
,
,(
)
(1)求
,并证明:当
时,
.
(2)求
以及
.
![](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/4cbb0f2883ddd23be9435fda33e9c611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa01f03fb074bff35b35e07047d11b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318361e80f3f5513f18e93719dba80d3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492969c502a62326a3c672549d61e0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
5 . 已知数列
的首项
,其前
项和为
,对于任意正整数
,
,都有
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)设数列
满足
,且
.
①求证数列
为常数列.
②求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f6b30f843cd1cadff8ba62275d01918.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d28fc397ca5e79e5a9e5d7aeba25725d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c092722926c8ea27ee343c9695a7e2b3.png)
①求证数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09878fbcc47b45cecd0e15d57ecff36e.png)
②求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab65c2ec8bf237ad09ce06bb70c249b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2019-06-14更新
|
809次组卷
|
2卷引用:河北廊坊市2018-2019学年高一下学期期中考试测试卷数学试题
6 . 已知数列
满足
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf1f0ee1e4aa19fb21bd9810937f4cd7.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7165585c4544af53772c11a7727da656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2019-06-14更新
|
1924次组卷
|
2卷引用:河北廊坊市2018-2019学年高一下学期期中考试测试卷数学试题
名校
7 . 已知
,若对任意正数
,
,不等式
恒成立,则实数
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd7c8bb1053fdb1d765247741cbf659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e711b4d34216b1ea832d8f9f3120fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2019-06-14更新
|
983次组卷
|
3卷引用:河北廊坊市2018-2019学年高一下学期期中考试测试卷数学试题
名校
8 . 在
中,内角
所对的边分别为
为
的面积,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb79d007858fc01b4992c53ef3e6d43.png)
,且
成等差数列,则
的大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d8b760e8712cca692c729c0f83842b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb79d007858fc01b4992c53ef3e6d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33311bc69c756da167542425c515dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
您最近一年使用:0次
2019-05-28更新
|
1714次组卷
|
5卷引用:河北省衡水市武邑中学2018-2019学年高一下学期6月月考数学试题
名校
9 .
的内角
所对的边分别カ
,则下列命题正确的是______ .
①若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac23f6ae54aa85cb26c124514c0c8ee2.png)
②若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d9caac472ab49e753350e5da7a29b9.png)
③若
,则
是锐角三角形
④若
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e33dd422f97bec998b36b681f3994d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac23f6ae54aa85cb26c124514c0c8ee2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4a17009863be02bee83baf29718120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d9caac472ab49e753350e5da7a29b9.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d913f37ddb7569c3de5078a3c20df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f900e2accd984de0fb5baa96592bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062cb9f8a1d6eeb390bda2d258fbce21.png)
您最近一年使用:0次
2019-05-23更新
|
1104次组卷
|
2卷引用:河北省唐山市第一中学2019-2020学年高一下学期期末数学试题
10 . 在
中,
,
为
边上的一点,且
,若
为
的角平分线,则
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1dd07c0571772e96d318f974724810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f9bba0e729202b7b71c72b5f2ae958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d457730189a606f18ef49a4001b4248.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2019-05-06更新
|
2970次组卷
|
7卷引用:【市级联考】河北省定州市2018-2019学年高一下学期期中考试数学试题
【市级联考】河北省定州市2018-2019学年高一下学期期中考试数学试题河北省保定市博野县2018-2019学年高一下学期期中数学试题【市级联考】内蒙古赤峰市2018-2019学年高一下学期期中考试数学试题安徽省示范高中2018-2019学年高一下学期第三次联考数学试题【校级联考】安徽省示范高中2018-2019学年高一下学期第三次联考数学试题安徽省阜阳市第三中学2018-2019学年高一下学期期末数学(文)试题(已下线)专题4-2 正余弦定理与解三角形小题归类1-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)