解题方法
1 . 记
的内角A,B,C的对边分别为a,b,c,且a,b,c成等比数列,以边
为直径的圆的面积为
,若
的面积不小于
,则
的形状为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4ece8552b387eb20f633c32f8142f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.等腰非等边三角形 | B.直角三角形 | C.等腰直角三角形 | D.等边三角形 |
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2 . 已知等比数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eab8f8926b996f9bee57d96067f5bac.png)
____________ .
![](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/a8b0b5a6da3a03456eca900531fb14b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eab8f8926b996f9bee57d96067f5bac.png)
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3 . 已知数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baace4b72eca0616a42834e515210a01.png)
(1)写出
;
(2)证明:数列
为等比数列;
(3)若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baace4b72eca0616a42834e515210a01.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed529240a883f68f0921e818addeb9c8.png)
(2)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9341a8e07b3e0af5b65ab199a25b0c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314501f06c7e4bf3112fe41ecac7be68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762bc360e4431d503ae8bd147d5a288c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2024-04-16更新
|
1998次组卷
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5卷引用:陕西省西安市西安中学2024届高三仿真考试(一)数学试题
陕西省西安市西安中学2024届高三仿真考试(一)数学试题河北省石家庄市2024届高三下学期教学质量检测(二)数学试卷(已下线)第二套 艺体生新高考全真模拟 (二模重组卷)(已下线)5.3 数列的求和问题(高考真题素材之十年高考)(已下线)压轴题05数列压轴题15题型汇总-1
4 . 已知等比数列
的前
项和为
,若
,且
成等差数列,则
( )
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d1163138c1c2dcd840472dff7b0d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2778e2dadff4d91102e6046bb5def8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-04-16更新
|
680次组卷
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6卷引用:陕西省西安市西安中学2024届高三仿真考试(一)数学试题
陕西省西安市西安中学2024届高三仿真考试(一)数学试题四川省德阳市重点高中2024届高三诊断模拟考试(二)数学(理科)试题(已下线)第三套 艺体生新高考全真模拟 (二模重组卷)(已下线)第二套 艺体生新高考全真模拟 (二模重组卷)河南省信阳市浉河区信阳高级中学2024届高三下学期三模数学试题(已下线)专题2 关键能力与方法问题(单选题4-7)
名校
解题方法
5 . 已知正项数列
的前
项和为
,前
项积为
,且满足
,则不等式
成立的
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b56d8b41fbd3e1eb44facd8836f3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4bd76c56e0e3c982d4504a8815b34ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.11 | B.12 | C.13 | D.10 |
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6 . 已知数列
满足
.
(1)证明:
为等差数列.
(2)记
为数列
的前
项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1491065f7eb24ff30047eb206399b59.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25cbe66fe4e84b4022721122baab4a3.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012e2159b5f44405d9317800d002ff1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2024-04-15更新
|
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名校
7 . 在等差数列
中,
,
.设
,记
为数列
的前n项和,若
,则
( )
![](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/0d29275f11876473e2e2d8ea769df23e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179319a983bda051c597ce8b0bcf8bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
A.5 | B.6 | C.7 | D.8 |
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8 . 已知函数
满足
,则满足
的最大正整数
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196a11beb5f29f0ebfbca200fb7786ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd3a42660a53f3c55f29f73b7494c810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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9 . 已知正项数列
是方程
的根,数列
满足公比是2的等比数列,
.
(1)数列
和
的通项公式;
(2)令
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88aa060c83e22b5a88ea98fad8869a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c640fc94b3b4376890a2bad231385250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f45f7683262f616027b6a23fc7e416a.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2692c5ed4561eb62b9e6e3b2da4036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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名校
解题方法
10 . 已知各项均为正数的等比数列
,满足
,
.
(1)求数列
的通项公式;
(2)设
,数列
的前n项和为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9ae092ad589a1e15a6318c9b5dd83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1210e41ff7470c6ff2b462f838de434f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b553ead560668d3e21eb67409bd1026f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af0d8d4f6e5b80bcb510173c5802358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45053d9b8ed6a89e67990e825cdf1400.png)
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2024-04-10更新
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