解题方法
1 . 已知正项等比数列
满足
,若
是
和
的等差中项,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa9f325b94ed4cf1e58636c49af2af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7677da1f68af02d80f4b04db9539502c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20147dab3fdc849c2ca7f32a2edecb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ee290ea11c19717a17ae23bbe57906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606f9410583a6e461630a58e53627019.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 设
为数列{
}的前n项和,已知
,且
.
(1)证明:{
}是等比数列;
(2)若
成等差数列,记
,证明
<
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d6a016b6cb27047fa22682a4846ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9efeb4455e30293d412938eeea85d5.png)
(1)证明:{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4294cb4b3f97d61bf7569aaa54b8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd89ddf27359acf69523df80335878c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915f4eeb65f99ad54800f4624eba1032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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3 . 已知等比数列
的公比为
,前
项的和为
,且
成等差数列,则
( )
![](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/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781f5f40488e5be4edb2220ca1b85573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5bf63073229c4be28e2d364158b9e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
A.![]() ![]() | B.![]() | C.![]() ![]() | D.![]() |
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4 . 在
中,“边a,b,c成等差数列”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5e7f74e65b90c9c78c919fedb98a90.png)
A.充要条件 | B.充分不必要条件 | C.必要不充分条件 | D.既不充分又不必要条件 |
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5 . 各项为正数且公比为q的等比数列
中,
,
,
成等差数列,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5453ec6a9e8b96357c888ea863ddcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01830165bafe5ca3ab03da4a6712039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d04a8b7a7595251251b8e0b7e665e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbe0c7a38d56b6d905973899bc91123.png)
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6 . 各项为正数且公比为
的等比数列
中,
成等差数列,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89bdf1717c68cfc8a306ee79757e7e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ddd29d9be23f415a03a41af881962c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9b29b4721a1abc7299569865672828.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 .
为等差数列
的前
项和,如果
,那么
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/53b5e2c97a11a92ad3a9f826e9ea148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8633e311e163d6ce7a0106bf768feed9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知
是等差数列,
是等比数列,
是数列
的前n项和,
,
,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeeb24f2d039075550dae5b32cdb2209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ca2fb9235cd31d4dbeb4dffe8d9d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e59af0c0209c8428b558da722a522935.png)
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9 . 在①
,②
为常数
,③
,这三个条件中选择一个,补充在下面横线中,并给出解答.
已知等差数列
的前
项和为
,
,且________.
(1)求
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762ed78224f86d0a24cf4b7fc1eed906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45a1ee923feab7f5cf94ca16ee2fa7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c07261d97255c5c1017a3a700d29ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7a6882053ae56c1e7b207226dcd70c.png)
已知等差数列
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d31d838f1c9455b912e71317b4d9bb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8170fd7e51aa2c8bb82e1be17f4922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解题方法
10 . 平面内一动点
到定直线
的距离,是它与定点
的距离的两倍.
(1)求点
的轨迹方程
;
(2)过
点作两条互相垂直的直线
,
(直线
不与
轴垂直).其中,直线
交曲线
于
,
两点,直线
交曲线
于
,
两点,直线
与直线
交于点
,若直线
,
,
的斜率
,
,
构成等差数列,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b0b7dc61346c291554562762fd0558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f998f87124daa3d26643725676b15c97.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b6a742dbacdab5aaa298007663dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce619c464f2aa04178ea0111ba60544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce619c464f2aa04178ea0111ba60544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce619c464f2aa04178ea0111ba60544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c5d04fbdee890603b0b3621037f3c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd6a1d6fab318824426e52464a575e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44368a1c81e2bb3608b412ac0c44f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546a035918f025942ca99b9ffebd8eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab4717e4827480f0f6f4ded85e52eab.png)
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