名校
解题方法
1 . 首项为1,公比为
的无穷等比数列
的各项和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5743a3bf50e8146f519a7b4f32a958b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
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2022-06-23更新
|
354次组卷
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4卷引用:上海市浦东新区2022届高考二模数学试题
2 . 若集合
,其中
和
是不同的数字,则A中所有元素的和为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac506f169ef6a4d0b90f708681c23d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
A.44 | B.110 | C.132 | D.143 |
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解题方法
3 . 雪花曲线是在1906年由瑞典数学家科赫第一次作出.如图所示,由等边三角形ABC开始,然后把三角形的每条边三等分,并在每条边三等分后的中段向外作新的等边三角形(并去掉与原三角形叠合的边);接着对新图形的每条边再继续上述操作,即在每条边三等分后的中段,向外画新的尖形.不断重复这样的过程,便产生了雪花曲线.雪花曲线的周长可以无限长,然而围成的面积却是有限的.设初始三角形ABC的边长为a,不断重复上述操作,雪花曲线围成的面积趋于定值为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 无限循环小数可以通过等比数列法转化为分数.如![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a608bf95339a27cf4366bcc5d99acac6.png)
;应用上述方法转化
(
,
为互质整数),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2236f581b11a0bb63addd062529acee8.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a608bf95339a27cf4366bcc5d99acac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a619c1d5651e32a70cfdeb205fcb56d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c26c147133b19c8be6a1895764ac4fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2236f581b11a0bb63addd062529acee8.png)
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5 . 将有穷数列
中部分项按原顺序构成的新数列
称为
的一个“子列”,剩余项按原顺序构成“子列”
.若{bn}各项的和与
各项的和相等,则称
和
为数列
的一对“完美互补子列”.
(1)若数列
为
,请问
是否存在“完美互补子列”?并说明理由;
(2)已知共100项的等比数列
为递减数列,且
,公比为q.若
存在“完美互补子列”,求证:
;
(3)数列
满足
.设
共有
对“完美互补子列”,求证:当
和
时,
都存在“完美互补子列”且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f595efafa6338971edfe04f1b9bcc86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知共100项的等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f475c927055f928ef747f646ed204d07.png)
(3)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1755ecac5afeffa09be399afde877f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d20fd487c74eec4c5bdc1a830da427d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0549acf7b40ed5c89102d791dae74bea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eab450ad326367b474f21a527afb0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f3b47edda8e766876404545ffc5a45.png)
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6 . 设无穷等比数列
的首项
,前两项的和为
,若所有奇数项的和比所有偶数项的和大
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2308a0aeed12a4353b098ae06e04af9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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7 . 计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe7131d69f11d727018353e3fa3bd25.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe7131d69f11d727018353e3fa3bd25.png)
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8 . 设无穷等比数列
的公比为
,且
,则该数列的各项和的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bcced763600088fd8e6e506b3ab25f.png)
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名校
9 . 设
为等比数列
的前
项和,若
,
,
,则
的公比的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94351ce858fa3f3a09cfadc2d23d7253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2021-08-16更新
|
284次组卷
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4卷引用:上海市2022届高考模拟卷(二)数学试题
上海市2022届高考模拟卷(二)数学试题(已下线)考向15 等比数列-备战2022年高考数学一轮复习考点微专题(上海专用)沪教版(2020) 选修第一册 同步跟踪练习 期末测试卷上海市嘉定区第一中学2021届高三下学期3月月考数学试题
10 . 设无穷等比数列
的公比为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086e9b14c35ef3c57b20f5e952ebf9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ee6ffb6fed1d13599ffc63128174ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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2021-05-05更新
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259次组卷
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3卷引用:上海市普陀区2022届高三上学期11月调研测试(0.5模)数学试题