若正整数m,n只有1为公约数,则称m,n互质,欧拉函数是指,对于一个正整数n,小于或等于n的正整数中与n互质的正整数(包括1)的个数,记作
,例如
,
.
(1)求
,
,
;
(2)设
,
,求数列
的前
项和
;
(3)设
,
,数列
的前
项和为
,证明:
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d40cb0f4dfbccdd4b6dadb06588fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53e72365953a1fb223b7255cc43e6f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfd9a60617c8638e87d01a952d2932c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6e0e717478bbfbea5f9fca5f6d4028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01caec6c6e5c4b804945e2582976f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54bb87c77b0f7cba419c5e949dfcbfe.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc25c5479b34200408841ddaff7c002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca1d86c9f078347773f700fee49d1d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a7839536eb987e895f99b7c5166ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.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/2706a7d38185b131eed172e78a5ea06a.png)
更新时间:2024-05-30 12:17:32
|
相似题推荐
【推荐1】已知等差数列
的前
项和为
.
(1)求
的通项
;
(2)设数列
满足:
的前
项和为
,求使
成立的最大正整数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696d7a230eb05bafe92ab9ddb1cf5dbf.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c104356b17b71d4e1a84f5ce10df37dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d5bbea34b1c957cb629c4580a898a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
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解题方法
【推荐2】已知公差不为0的等差数列
中,
且
,
,
成等比数列.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若数列
满足
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7088824e4b57d70d0bb0efe2029cd91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a59273f38da20591143535609120367.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)
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适中
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【推荐1】已知数列
是公差为2的等差数列,且
成等比数列.
(1)求
的通项公式;
(2)令
,记数列
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5eee5a822815b309b42c06ac627561.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6717d4d71b909cda5ecf0d3111dabd0.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/e672c3d231081d12e44a4211e5ac60bf.png)
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解题方法
【推荐2】在①
,
,
成等差数列,②
,
,
成等比数列,③
,
,
成等差数列这三个条件中任选一个,补充在下面的问题中,并作答.
已知正项等比数列
的前
项和为
,且
,______.
(1)求数列
的通项公式;
(2)设
,求
的前
项和
.
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/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1f3e78e61d7800b409fbdd68bc363a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1267b1f82f7465fbc9a1dff2b01a0c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051c3ac5c47bb0db69aa08655cf414a3.png)
已知正项等比数列
![](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/cd3f78fb6b1fdf9fa36252e59a444a3d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c6134fd88cd220598f1d7626554641.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)
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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名校
解题方法
【推荐1】已知实数
,定义数列
如下:如果
,
,则
.
(1)求
和
(用
表示);
(2)令
,证明:
;
(3)若
,证明:对于任意正整数
,存在正整数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3ac83c571110d41a396d12d8eea1c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313b65380c90e925512cf9ffa1d35623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d911bd308c26935e73225bdaa649d136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc488132d003f78ebd89c50cd5aef63a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb119ab040107b705247d6f56d7dfa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b6423d848b3b786d6ccf0f2db220a9c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bee2fbffbc3c3e9b40046faf9e25ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023ceb03fb474641869492f3388a2aff.png)
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【推荐2】对于数对序列
, 记
,
其中
表示
和
两个数中最大的数,
(1)对于数对序列
, 求
的值
(2)记m为a、b、c、d四个数中最小的数, 对于由两个数对(a, b), (c, d)组成的数对序列
和
, 试分别对m=a和m=d时两种情况比较
和
的大小
(3)在由5个数对(11, 8), (5, 2), (16, 11), (11, 11), (4, 6)组成的所有数对序列中, 写出一个数对序列P使
最小, 并写出
的值(只需写出结论).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3730b8da80bf83e139d6f2d6431e26fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf9a27f4aed79c1fd9ef8d15fe0d66e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3aed1d5b877fe312c64942a1a4611eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ac724a0f7a5e3bb92f78d639b805eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d3e4bf1f333fbf630ad1750d9a61ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1433338626912da998383a1988052cdc.png)
(1)对于数对序列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d76ac485f6b79bef518f8750953fc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2159dad0a02fd2545166b1f11eae990.png)
(2)记m为a、b、c、d四个数中最小的数, 对于由两个数对(a, b), (c, d)组成的数对序列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e9eb00b35d29d8f97c4b86a02a5b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7b8896c67827fd8f6d11248f7d0a61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58446046e1d26e7db0d85cf799a64f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11ae81a29ebc46e60dacd34f2afa667.png)
(3)在由5个数对(11, 8), (5, 2), (16, 11), (11, 11), (4, 6)组成的所有数对序列中, 写出一个数对序列P使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983db6139d32e042c0018c0901a4bd70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983db6139d32e042c0018c0901a4bd70.png)
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【推荐1】已知二次函数
的图像经过坐标原点,其导函数为
,数列的前
项和为
,点
均在函数
的图像上.
(1)求数列
的通项公式;
(2)设
,
是数列
的前
项和,求使得
对所有
都成立的最小正整数
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ebed875e910bfa41c04813ba108f74.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/a4213bdcb23a92aa222b747043ea8a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27b515f1a285ff1286ac597cce326b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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/463e670d40ac857529acb9ed92f43661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知等比数列
的前
项和
,数列
的前
项和为
,
.
(1)求
和
;
(2)若
对于一切
恒成立,求整数
的最小值.
![](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/538ae79b15f8eb4c9f61b4c4df899480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e987756fedea2408cd8c8a0672c3f50.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/69b4e688ad5156121531f6e0f4b4c1eb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d83182b833c0aae76c8848e31f810d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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