名校
1 . 在
中,角
,
,
的对边分别为
,
,
,且
.
(1)求角
的大小;
(2)若等差数列
的公差不为零,
,且
、
、
成等比数列,求
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.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/5443be85ce62718420569f8641f2923e.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60123fc40eaada354950dd2ebca1d05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb5ca241bb7c313ef0366d3ddba93bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d199f9235e3bd36bfa78c3772e941896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd23afcb34b2d393f9a09399f5ee4692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f204dda72fadaaf727b846fbc9a653d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
您最近一年使用:0次
2018-11-30更新
|
4276次组卷
|
8卷引用:【全国百强校】河北省衡水中学2019届高三上学期七调考试数学(文)试题
解题方法
2 . 已知数列
是公差不为0的等差数列,
,
成等比数列.
(1)求
;
(2)设
,数列
的前
项和为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0abedd59476f8793d5a8948590a70c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ad29870419d1ca48b69c128fd18b79.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe3f6bad68504112541c2d87d467b73.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2018-10-18更新
|
1618次组卷
|
2卷引用:【市级联考】河北省唐山市2019届高三上学期第一次摸底考试数学(文)试题
名校
3 . 正项等差数列
满足
,且
成等比数列,
的前n项和为
.
(1)求数列
的通项公式;
(2)令
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070f12b34f9e5c6773948f1168e237ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cde755dc403145c2453654c6fe3002b.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
2018-08-27更新
|
791次组卷
|
7卷引用:【全国百强校】河北省唐山市迁安市第三中学2018届高三上学期期中理数试题
名校
4 . 已知等差数列
的公差为
,若
,
,
成等比数列,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](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/3e88093a749c0d46e0ee931ecfaff925.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-07-02更新
|
2792次组卷
|
3卷引用:【全国百强校】河北省衡水中学2019届高三上学期五调考试数学(文)试题
(已下线)【全国百强校】河北省衡水中学2019届高三上学期五调考试数学(文)试题【全国百强校】北京海淀101中学2016-2017学年高一下学期期中考试数学试题广东省深圳市盐田高级中学2023-2024学年高二下学期4月月考数学试题
名校
5 . 已知等比数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06ef951f417999eb27a611d385c1a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f107c2404ef780241eeecd14a4df51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a117164ec1758148a79329a16d27d7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06ef951f417999eb27a611d385c1a31.png)
A.![]() | B.-8 | C.8 | D.16 |
您最近一年使用:0次
2018-05-01更新
|
2016次组卷
|
6卷引用:【衡水金卷】河北省衡水中学2018届高三毕业班模拟演练一理科数学试题
6 . 下列命题:①函数
的最小正周期是
;
②在等比数列
中,若
,
,则
;
③设函数
,若
有意义,则
;
④平面四边形
中,
,
,则四边形
是菱形.
其中所有的真命题是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785b9b0fecd8b968e797161de5296ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
②在等比数列
![](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/ea6c2e49c873187b12e90a7b4d5d906b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b14225739d940543645f0d1ddc4aee3.png)
③设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c792e2a6fe1f10ba6ad31b4e9add219b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29eb0f6c64da6b2ce0eab2690f6dfb71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823ab696d27d40920c39b8c910789380.png)
④平面四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e878fe7ac6f7dd367e334b508f47ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62241d427a46df39fb00d0ac2f9b1d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
其中所有的真命题是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
A.①②④ | B.①④ | C.③④ | D.①②③ |
您最近一年使用:0次
解题方法
7 . 已知
,且
依次成等比数列,设
,则
的大小关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e13986ea9ae36f5f8dfdc0fe7371078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1366b5181014f4d5fbe0d6528a996f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b511bcbe94aa484c0a067891fbf7968.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 在
中,
是
的对边,若
成等比数列,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1466856bf2570685d3629c1f813748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df23cc36e6d0a1f5bfc6b7a1cde0d4b5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
9 . 已知正项数列
是公差为2的等差数列,且24是
与
的等比中项.
(1)求数列
的通项公式;
(2)若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b53c7c703af0668331b4d6d5470e544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3783e69ef5a6a0af566ff4e21ccf03.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fce97beff11a17a1334dbb51f53be2.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/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2017-10-03更新
|
604次组卷
|
5卷引用:河北省邢台市2018届高三上学期第一次月考数学(理)试题
名校
10 . 已知各项不为0的等差数列
满足
,数列
是等比数列且
,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950bef0ee17c25bed6689e242dc4176f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9c77ce4d6b6f7c75a8b84b5c3c6c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0dbda699c3079178016f05a01b8ce1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-08-18更新
|
2134次组卷
|
9卷引用:河北省石家庄市辛集中学2019-2020学年高三上学期期中数学(文)试题