解题方法
1 . 在锐角
中,内角
的对边分别为
,已知
.
(1)证明:
;
(2)求
的取值范围.
![](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/5493478edaf7091ebaa4e3a51c575817.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc20d351d51723c9b0a07a20ac14114.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612597174b06f21ea6f25354fc7296cc.png)
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名校
解题方法
2 . 设
的内角
的对边分别为
,已知
.
(1)判断
的形状(锐角、直角、钝角三角形),并给出证明;
(2)求
的最小值.
![](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/54c6c2a720e08776fba148a951b011ea.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18656e89c57aaa7b365fc73fa0c913e3.png)
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2023-05-12更新
|
735次组卷
|
3卷引用:浙江省七彩阳光联盟2022-2023学年高一下学期期中数学试题
解题方法
3 . 记△ABC的内角A,B,C的对边分别为a,b,c,已知
.
(1)证明:
;
(2)若△ABC的面积为
,求B.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42bfbfe4b84bbb99307835dab5e51970.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec3565449fe1baaec60313521173454.png)
(2)若△ABC的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c288e5bf4c875ceb8544b0d582e318cb.png)
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解题方法
4 . 数列
满足
,
,
.
(1)求
、
,并求数列
的通项公式;
(2)求数列
的前
项的和
;
(3)设
,
,证明:当
时,
.
![](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/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fdc7281994eeeddf1343344a62afac2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b50ec7342673cc1f11b613c3efd3c6c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ee6152ab3f589a4c18ad2e1207e814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd597fd3e8cf7d5fb0de8c0f18bd785c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831608f09609c37f757f5bfcd01253f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e004226f9f156370a21753ad0a918c06.png)
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5 . 在①
,②
这两个条件中任选一个,补充在下面问题中,并作答.
问题:记
的内角
的对边分别为
,且__________.
(1)证明:
;
(2)若
,求
的取值范围.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9936660ad4e752fb2455d3fa8caa0b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5468d321a91311c3e025198e47f6c4e2.png)
问题:记
![](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)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58dcd555dcb96af6d37ed1b06d581fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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解题方法
6 . 在四棱锥
中,
平面
,底面
为正方形,
,E和F分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/97e305e8-d789-4b54-a36b-cb69e8b2f3c5.png?resizew=165)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/97e305e8-d789-4b54-a36b-cb69e8b2f3c5.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28b5b7b3ce8cfd88c3428883bd0852e.png)
您最近一年使用:0次
2023-04-27更新
|
1966次组卷
|
3卷引用:浙江省浙南名校联盟2022-2023学年高一下学期期中联考数学试题
名校
解题方法
7 . 已知数列
满足:
,且对任意的
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8cd0b8e4b3a46107765f9753582e51.png)
(1)求
,
的值,并证明数列
是等比数列;
(2)设
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1505d56f0b35fe7f2de1fe1888036e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8cd0b8e4b3a46107765f9753582e51.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455c80179eedfb491b8f0944f389b0d8.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1462386851f9208200c3a9826e0896d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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
2023-04-15更新
|
2442次组卷
|
7卷引用:浙江省湖州、衢州、丽水三地市2023届高三下学期4月教学质量检测(二模)数学试题
浙江省湖州、衢州、丽水三地市2023届高三下学期4月教学质量检测(二模)数学试题(已下线)专题04 数列(已下线)押新高考第18题 数列综合(已下线)上海市静安区2023届高三二模数学试题变式题16-21广东省广州市从化区从化中学2023届考前仿真模拟1数学试题湖南省长沙市实验中学2023届高三三模数学试题(已下线)第03讲 等比数列及其前n项和(九大题型)(讲义)-2
8 . 数列
满足:
,等比数列
的前
项和为
,
.
(1)求数列
的通项公式;
(2)若数列
的前
项和为
,试证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183ae2a12f21350e45292420480b9628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/9239f2bcb1822f1785fc33852cdccda6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b882742adff739f2cc0df78bcca20c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c3fec47d2dd2b8099d86c87b6e57de8.png)
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2023-04-21更新
|
436次组卷
|
2卷引用:浙江省杭州地区(含周边)重点中学2022-2023学年高二下学期期中联考数学试题
名校
解题方法
9 . 西部某地为了贱行“绿水青山就是金山银山”,积极改造荒山,进行植树造林活动,并适当砍伐一定林木出售以增加群众收入,当地2022年年末有林场和荒山共2千平方公里,其中荒山1.5千平方公里,打算从明年(2023年)起每年年初将上年荒山(含上年砍伐的林区面积)的16%植树绿化,年末砍伐上年年末共有林区面积的4%以创收.记2023年为第一年,
为第n年末林区面积(单位:千平方公里).
(1)确定
与
的递推关系(即把
,用
表示)
(2)证明:数列
是等比数列,并求
;
(3)经过多少年,该地当年末的林区面积首次超过1.2千平方公里?
(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(1)确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
(2)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9615925ff99b6e87881c26e4365440fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(3)经过多少年,该地当年末的林区面积首次超过1.2千平方公里?
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16bbda3eac8b2848d29b7562662c79f.png)
您最近一年使用:0次
2023-04-20更新
|
315次组卷
|
5卷引用:浙江省湖州市2022-2023学年高二上学期期末数学试题
名校
解题方法
10 . 在
中,角
,
,
的对边分别为
,
,
.若
为锐角三角形,且满足
.
(1)证明:
;
(2)若
,
的面积为
,求
的周长.
![](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/56ac8e446826ea6e653cd1ac6d5d6106.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b104867a12d24a353d94858c2fa17c8f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f15d84d978481084f6e35a46b4ab460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb92317ebf925d7c25c35e44111392ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次