1 . 设数列
,
,
,…满足条件
,
其中n是某个固定的自然数.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f7dcce39f3d4dc6b7faf84dc1d0a1.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/d3954c19f9f2b479d44a6b2c910343d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d5d2e376e3cbae1057d3c34bb7dfba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9baf2da944bd8917bb14235f0c350f85.png)
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解题方法
2 . 已知
,
,
,且
,
(1)当
时,求证:
;
(2)试确定一个正整数
,使得当
时,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c186bdfee995e00926e87038d89d3b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc24093802f0829507de916a9f36a8a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1be6798f6f5497315b6a746acbfd34.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeddacf7c4a05e26f51af7c7039b47a.png)
(2)试确定一个正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac346f77f4b0c3c5577266897b8cf61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01a861e978d9c979c2c4f73614a3d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7955b8ef0f2dd72cf04b84ad2166ae.png)
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3 . 在直角坐标平面内有线段
,已知点
是线段
上靠近
的三等分点,点
是线段
上靠近
的三等分点,……,点
是线段
(
,
)上靠近
的三等分点,设点
的横坐标为
.
(1)求证:数列
为等比数列;
(2)若
,
,求
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11603c89c66f064b263af841dae023f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039af66355ed85ff4c204931b882b694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f614bf2bc35c4aaf1123d829f7fa82dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c65a855b1eed9c43e6829f6c3bffb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
4 . 如图,在
中,AB边上有一点
,点
是线段AB的三等分点,点
为线段DC上的一点(不与点D、C重合),若分
所成的比为
,连接AM,且有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6d728b430549f00bb9c0a7bf8bf7d.png)
.
来分别表示
;
(2)假设函数
,存在数列
,首项
,当
时,对前
项和
有
成立,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c085dbb9d78aef7d81c3f4d6855f067b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6d728b430549f00bb9c0a7bf8bf7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb21c93a67900cb3f53370778737e9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e647c14561826ba9e396acc5a3792c.png)
(2)假设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be1e04bececc665e7253c524deb9bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5ae2b385f9e759d3316764878dfa99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
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5 . 已知数列
和
满足:
.
(1)设
求
的值;
(2)设
求数列
的通项公式;
(3)设
证明:______.
请从下面①,②两个选项中,任选一个补充到上面问题中,并给出证明.
①
;②
其中
.
注:若两个问题均作答,则按第一个计分.
![](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/08416257a7c5427d9266e9ee46ee492b.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb3a4652ccd6c113de9645852973d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08360bbdf8e90d7d35445ea6e9923658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a27e634b912cd518c69ff3ffb74db8.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc35823313a638d6dcf399efaeff9e0.png)
请从下面①,②两个选项中,任选一个补充到上面问题中,并给出证明.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51206c051804c48be676c6510c63ce3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b09b55a8bc170344adf78ee08ea8892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce671943072553870e3c059e835e980c.png)
注:若两个问题均作答,则按第一个计分.
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解题方法
6 . 定义:如果数列
从第三项开始,每一项都介于前两项之间,那么称数列
为“跳动数列".
(1)若数列
的前
项和
满足
,且
,求
的通项公式,并判断
是否为“跳动数列”(直接写出判断结果,不必写出过程);
(2)若公比为
的等比数列
是“跳动数列”,求
的取值范围;
(3)若“跳动数列”
满足
,证明:
或
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb9b2753cbe161dbdd89367e79f0c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若公比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(3)若“跳动数列”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7e0958c821b62db19782ebdf5c2e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1aebaa175416b76dea03554c2c52420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eae48cb8691cabf96b1b023f4b744cc.png)
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解题方法
7 . 如图所示,四边形
是平行四边形,过点
的直线与射线
、
分别相交于点
、
,若
,
.
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701196987301888/2790360975630336/STEM/62fac8bd-0356-4b95-94e5-2d1ac8ac7b16.png?resizew=341)
(1)把
用
表示出来(即求
的解析式);
(2)设数列
的首项
,前
项和
满足:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39758894bf29f5c85e76dc924b6db834.png)
,求数列
通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f68923146cb9aa2fec930b91fdc9b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1992fe65cd5c5cbbcfe95e370072d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcae23616b928078169005f69e934722.png)
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701196987301888/2790360975630336/STEM/62fac8bd-0356-4b95-94e5-2d1ac8ac7b16.png?resizew=341)
(1)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)设数列
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39758894bf29f5c85e76dc924b6db834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd048fe3fbd6b0623f146a0ef9021e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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8 . 已知无穷数列
满足
,数列
是各项和等于
的无穷等比数列,其中常数b是正整数.
(1)求数列
的通项公式;
(2)在无穷等比数列
中,
,
,试找出一个b的具体值使得数列
的任意项都在数列
中;试找出一个b的具体值,使得数列
的项不都在数列
中,简要说明理由;
(3)对问题(2)继续进行研究,探索当且仅当b取怎样的值时,数列
的任意项都在数列
中,说明理由.
![](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/edeb9219bc827a68e460e81794725476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c2449cbfd82200808381d7d9cb73ac.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)在无穷等比数列
![](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/012f1e5df0528c0f9a5754b7dc84424e.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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)对问题(2)继续进行研究,探索当且仅当b取怎样的值时,数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
9 . 已知
两个盒子中各有一个黑球,一个白球.每次从两个盒子中各随机取出一个小球交换后放回.记
次交换后,
盒子中有一黑一白两个小球的概率为
盒子中黑球的个数为
.
(1)求
;
(2)求
的数学期望
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f78093af1942339f74a1ec6e99aaab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d0f3799612b81e85b87241ec8eee68.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d0f3799612b81e85b87241ec8eee68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6522c8c52be9ae43994b0cfccaa887f.png)
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