在数列
中,
,当
时,其前n项和
满足
.
(1)求证:数列
为等差数列;
(2)设
,数列
的前n项和为
,求使得
对所有
都成立的实数m的取值范围.
![](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/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45096a327f6e10f1ba80ff96cc436d4c.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad83668ff336589f82a2cd04db9f9947.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d622a4923d05e180df3206c7d08d5b59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7568d0b4794178ffa4ba99f5ce7ac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2aa78c96db411c9e1e939ae16de78d3.png)
更新时间:2021-10-02 22:36:07
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】在孟德尔遗传理论中,称遗传性状依赖的特定携带者为遗传因子,遗传因子总是成对出现例如,豌豆携带这样一对遗传因子:
使之开红花,
使之开白花,两个因子的相互组合可以构成三种不同的遗传性状:
为开红花,
和
一样不加区分为开粉色花,
为开白色花.生物在繁衍后代的过程中,后代的每一对遗传因子都包含一个父系的遗传因子和一个母系的遗传因子,而因为生殖细胞是由分裂过程产生的,每一个上一代的遗传因子以
的概率传给下一代,而且各代的遗传过程都是相互独立的.可以把第
代的遗传设想为第
次实验的结果,每一次实验就如同抛一枚均匀的硬币,比如对具有性状
的父系来说,如果抛出正面就选择因子
,如果抛出反面就选择因子
,概率都是
,对母系也一样.父系、母系各自随机选择得到的遗传因子再配对形成子代的遗传性状.假设三种遗传性状
,
(或
),
在父系和母系中以同样的比例:
出现,则在随机杂交实验中,遗传因子
被选中的概率是
,遗传因子
被选中的概率是
.称
,
分别为父系和母系中遗传因子
和
的频率,
实际上是父系和母系中两个遗传因子的个数之比.基于以上常识回答以下问题:
(1)如果植物的上一代父系、母系的遗传性状都是
,后代遗传性状为
,
(或
),
的概率各是多少?
(2)对某一植物,经过实验观察发现遗传性状
具有重大缺陷,可人工剔除,从而使得父系和母系中仅有遗传性状为
和
(或
)的个体,在进行第一代杂交实验时,假设遗传因子
被选中的概率为
,
被选中的概率为
,
.求杂交所得子代的三种遗传性状
,
(或
),
所占的比例
.
(3)继续对(2)中的植物进行杂交实验,每次杂交前都需要剔除性状为
的个体假设得到的第
代总体中3种遗传性状
,
(或
),
所占比例分别为
.设第
代遗传因子
和
的频率分别为
和
,已知有以下公式
.证明
是等差数列.
(4)求
的通项公式,如果这种剔除某种遗传性状的随机杂交实验长期进行下去,会有什么现象发生?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306ac9722099868f11c37067a24f3892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa77d305db1c083465d3895d45dc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306ac9722099868f11c37067a24f3892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa77d305db1c083465d3895d45dc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631cfbc0b6874a78f729f80206f48c6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f72c3b3c76c6425af1dc19e294aef9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4929d6cf167d87aca3066dfe9e922a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b75fc182d81803f162afef21ca1ccd4.png)
(1)如果植物的上一代父系、母系的遗传性状都是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306ac9722099868f11c37067a24f3892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa77d305db1c083465d3895d45dc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
(2)对某一植物,经过实验观察发现遗传性状
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306ac9722099868f11c37067a24f3892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa77d305db1c083465d3895d45dc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765b17af0423aaa4cba9fa8ac5d5cb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306ac9722099868f11c37067a24f3892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa77d305db1c083465d3895d45dc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c01801a157a04c6cb60a6e83520fc3d.png)
(3)继续对(2)中的植物进行杂交实验,每次杂交前都需要剔除性状为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306ac9722099868f11c37067a24f3892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e25893a9dc7878e82704f1eca13cd6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fa77d305db1c083465d3895d45dc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5604a87a7559957790a4256fdb9ae1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27fcefc46eb5846a5b8b4e6d414c9b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffb021aa7d5a5c2f0691e337caad624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce603aa3abcb61750d2191aaa13dddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b895cbbb5b1d230f5313fb5a383325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28a32aa53105ca3944205fbf56ec5ea.png)
(4)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1205bec8d8dcece4da57a6e0c555230a.png)
您最近一年使用:0次
【推荐2】已知数列
满足
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
(1)求证:数列
为等差数列;
(2)设
,记集合
中元素的个数为
,求使
成立的最小正整数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdcf8fda438f04d9782615e1a0e6b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099a64d86bd0b4602578d910322adc1b.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef01121cb642c6cd36403fb22bb126d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b8e547fdea9170fd53dba330364043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233427826eb2233641fc3a9805f6d206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89534d323eb4c5f2f78869e79069f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
【推荐1】已知数列
的前n项和为
,且
是公差为2的等差数列.
(1)求
的通项公式以及
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847e0687921e0da8cd49a4736c795ede.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c9965a04c2a6de04e949a15762f372.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72e393e788b6e99b9b1e42db38f578d.png)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】已知等差数列
的公差为d,前n项和为
,数列
为递增的等比数列,公比为q,前n项和为
,且
.
(1)求数列
的通项公式;
(2)设
的前n项和为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092c794d71dd9f51b5fce4068f095dba.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ac50e331f1beeef96d4226ce37879e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15526f7c892333030073b85fc3baee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cc28a47e830ce0a97a03d57b5139e5.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】数列
的前
项和
,等比数列
满足
,且
是
的等差中项.
(1)求数列
的通项公式:
(2)记
,求数列
的前
项和
.
![](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/1b982b2d1d703e124c0f2c5894bf908c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9075726bf929d3458a0c9eaf39d46e13.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258d72e59ea9a84ca53fb30d868a2db9.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)
您最近一年使用:0次
解答题-问答题
|
适中
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名校
解题方法
【推荐2】已知数列
的各项均为正数,其前
项和为
,满足
.
(1)证明:数列
为等差数列;
(2)求满足
的最小正整数
.
![](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/b64ce77ac6be49646626598b621bc68c.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8dfb2af5bfd44046042a50e6edc1c4.png)
(2)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b9115efefd4e68d1ad1171a799db7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】已知数列
为等差数列,且满足
,
,数列
的前
项和为
,且
,
.
(1)求数列
的通项公式;
(2)证明:
是等比数列,并求
的通项公式;
(3)若对任意的
,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd5359c8fdc022d7044ffb6fdb291666.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf86d176e66c7defe5a2543108e0769.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad9f4c2dc01c8eda8d6da00ae25851a.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28529c0bdef3454044e37c4c949ccc66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
解答题-问答题
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(0.65)
名校
解题方法
【推荐2】数列
满足
.
(1)求
的通项公式;
(2)设
,数列
的前n项和为
.若对于任意正整数n,均有
恒成立,求m的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cca5ec0f1af152b1993fa3b041f8356.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af81b8983a36debb3c1f6339a6eeef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa1cfa5a0b44fbe9be0bfd7861ba835.png)
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