1 . 已知数列
,
,
,若数列
、
都是等比数列,公比分别是
、
,设
是数列
的前
项和,数列
是
的零点按从小到大的顺序排成的数列.
(1)求数列
的通项公式,并证明:
;
(2)证明:
,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc0d9ecf4a552405584ef092db53508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40dc43b8d11d5462e4b525dd7b03bcfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e79faea88f4bf336ea6cae4b14e5f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6268630d5e5288048d32f4aa5c8bc02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4e2aba0ca1d981cb845d5f58257a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53aaf8438a97b289940956774fd7701.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e31dda3a56eb4c92347b3ea80143fc6.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/293f50856f92a18be3301a658781a8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc9e71aae5fbed265ba31ab9b5cfc78.png)
您最近一年使用:0次
2020高三·全国·专题练习
2 . (Ⅰ)已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9bce895524039d598cbec1aecfcee7.png)
,其中
为有理数,且
.求
的最小值;
(Ⅱ)试用(Ⅰ)的结果证明如下命题:设
为正有理数.若
,则
;
(Ⅲ)请将(Ⅱ)中的命题推广到一般形式,并用数学归纳法证明你所推广的命题.
注:当
为正有理数时,有求导公式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9bce895524039d598cbec1aecfcee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab03556c333ab0b55fe86c937b2a5763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f7910d0e12b74383a4914078b562038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(Ⅱ)试用(Ⅰ)的结果证明如下命题:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d004eecf8d05e36f6b7f70f12e91a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34465307caa0420640e30be616ee0cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3641364915d394d354ee6b3324164995.png)
(Ⅲ)请将(Ⅱ)中的命题推广到一般形式,并用数学归纳法证明你所推广的命题.
注:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff992a062b720bacdd56dae4cc8a30c5.png)
您最近一年使用:0次
3 . 我们称满足:
(
)的数列为“
级梦数列”.
(1)若
是“1级梦数列”且
,求
和
的值;
(2)若
是“1级梦数列”且满足
,
,求
的最小值;
(3)若
是“0级梦数列”且
,设数列
的前
项和为
,证明:
(
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2fa3ec054db237c3dc3f6785253eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d116ca533beba0630be998d6ff1214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930de0d297e940bbf1faab22ff70b8b2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79c9c1e08cdce10e202984d1a228c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc22e7024a7dc8f5e6f7869bf1e41c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42bd0954c485ed2b67cfd38f1acf6c75.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/199501da83fb2f3062167a17565c17bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea49f8a2b98b542b1ebb2ac813346c90.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/46514294c73c544d81505d82ecd5a22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
您最近一年使用:0次
4 . 已知数列
,
,且
.
(1)若
的前
项和为
,求
和
的通项公式
(2)若
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f640e0aa3be39a91b8e935fc44a1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)若
![](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/c863b250e389c3992dd27963a0b78900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0ea0834c58d628bd07d58e7199c8a39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e219098488d0b67b85775327471459.png)
您最近一年使用:0次
2020-09-23更新
|
1519次组卷
|
5卷引用:浙江省2020届高三下学期4月适应性测试数学试题
浙江省2020届高三下学期4月适应性测试数学试题(已下线)考点65 数学归纳法(练习)-2021年高考数学复习一轮复习笔记(已下线)专题7.7 数列与数学归纳法单元测试卷(测)-2021年新高考数学一轮复习讲练测(已下线)4.4 数学归纳法-2020-2021学年高二数学课时同步练(人教A版选择性必修第二册)沪教版(2020) 一轮复习 堂堂清 第四单元 4.7 数列的应用(二)
5 . 已知无穷数列
,
,
满足:
,
,
,
.记
(
表示
个实数
,
,
中的最大值).
(1)若
,
,
,求
,
的可能值;
(2)若
,
,求满足
的
的所有值;
(3)设
,
,
是非零整数,且
,
,
互不相等,证明:存在正整数
,使得数列
,
,
中有且只有一个数列自第
项起各项均为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086e9b14c35ef3c57b20f5e952ebf9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36460040ddea4761eee10d537b14a1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6844fe4d1c900139f36ebf2a9a782c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6856bfc1657012b5f778ec95b8fd0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e589b5e3174af75615c4e0fd9a06330f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe682301f4353365c95405406797b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c7767875fb53708a9c88c6c70cca31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f85dca6d37fa48a9c42a6481cb3738b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0736457346c11dd6f458418a4f747ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3e32f036aa4ba5547e0d7a95de0dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d45b9569448decf7d1a367020fb99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76cd99502cbbadcd585f0fd0b47f096c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d4d802eaa971a74d0ec3af38b80cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbcbd2a766b7cce3d1e35dd6b6c2530a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9d22d6d70996be38315a1ed664f62e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c264cca2d434effa117b1b1bdd392142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086e9b14c35ef3c57b20f5e952ebf9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36460040ddea4761eee10d537b14a1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6844fe4d1c900139f36ebf2a9a782c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
您最近一年使用:0次
6 . 已知数列
是无穷数列,满足
.
(1)若
,
,求
,
,
的值;
(2)求证:“数列
中存在
使得
”是“数列
中有无数多项是1”的充要条件;
(3)求证:存在正整数k,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5bad0e0832bbf42a12f4efc86cfe0e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
(2)求证:“数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fb67a858cf21e675a4be5ae0bc49c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64e4722de7deb7c05ca986166e6eb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)求证:存在正整数k,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bded46375833efe7c9143aa80f8d64.png)
您最近一年使用:0次
2020-09-13更新
|
1035次组卷
|
3卷引用:2020届北京市中国人民大学附属中学高三上学期期中模拟统练(七)数学试题
2020届北京市中国人民大学附属中学高三上学期期中模拟统练(七)数学试题上海市复旦大学附属中学青浦分校2020届高三下学期开学摸底数学试题(已下线)专题15 数列不等式的证明 微点6 数列不等式的证明综合训练
2020高三·全国·专题练习
7 . 设
是偶函数,且当
时,
.
(1)当
时,求
的解析式;
(2)设函数
在区间
上的最大值为
,试求
的表达式;
(3)若方程
有四个不同的实根,且它们成等差数列,试探求
与
满足的条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3190b1df78874a2236c18058a00cbe78.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71dbce0ccda0f5df7d0555fa23bf770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b3ae7e5228fd1acb0d46f6941143a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b3ae7e5228fd1acb0d46f6941143a7.png)
(3)若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c0d827ef8598ba6b70b34b2bdcd1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
名校
8 . 若定义在
上的函数
满足:对于任意实数
、
,总有
恒成立.我们称
为“类余弦型”函数.
(1)已知
为“类余弦型”函数,且
,求
和
的值.
(2)在(1)的条件下,定义数列
求
的值.
(3)若
为“类余弦型”函数,且对于任意非零实数
,总有
,证明:函数
为偶函数;设有理数
,
满足
,判断
和
的大小关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bde53de43dda74249725823c0e6610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8492210fbc3ea3678bbc96c6b35240e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38fffbc7ab9882480f4faa72390e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d55ef0d1b7ea88d92fd6e1ecebb5f5.png)
(2)在(1)的条件下,定义数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38da8a0c3c1dfd8b3e962c1aaa2f5658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1eadf6776d4dd27e4f021d54ec4036.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caea9a696f22c76f8f4563ac45d124b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c983d456ac12b40aea1fd87e961c07b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9769116ec47353514e6b7fb7b17216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542893790445d6d888d9ff91fd215c9c.png)
您最近一年使用:0次
2020-09-06更新
|
938次组卷
|
2卷引用:上海市建平中学2019届高三下学期2月月考数学试题
名校
解题方法
9 . 已知函数
,
.
(1)判断函数
在区间
上的零点的个数;
(2)记函数
在区间
上的两个极值点分别为
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e36533dcead729de6de870950cc3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f4716b6d4e74cb1209ea8a10db84bb.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3cee5e50ee4f1dfbcf0ff0312fef1b.png)
(2)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3cee5e50ee4f1dfbcf0ff0312fef1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d2fa87868bb2d64c96e0e2b90d0cf6.png)
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2020-09-06更新
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4161次组卷
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9卷引用:2020届四川省宜宾市高三第二次诊断测试理科数学试题
2020届四川省宜宾市高三第二次诊断测试理科数学试题广东省广州市天河外国语学校2019-2020学年高三下学期线上测试数学(理)试题安徽省怀远一中、蒙城一中、淮南一中、颍上一中、涡阳一中2020届高三5月五校联考数学理科试题(已下线)专题21 函数与导数综合-2020年高考数学(理)母题题源解密(全国Ⅰ专版)(已下线)专题20 函数与导数综合-2020年高考数学(文)母题题源解密(全国Ⅰ专版)(已下线)极值点偏移专题03 不含参数的极值点偏移问题江西省新余一中、宜春一中2020-2021学年高二上学期联考数学文科试题(已下线)专题14 导数综合应用的解题模板-学会解题之高三数学万能解题模板【2022版】吉林省实验中学2022-2023学年高三上学期期末数学试题
解题方法
10 . 平面向量
,
,
满足
,
(
且
),则
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb573cc0f30d5c32cdad1510793f0e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f64154bf2733bfc572d668f869220b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ef0924e737052be75edad9bedaac3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdfb8b0aba93b2eef5f11f4b7ae4592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24c686fbaaa68705d654b880481ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f352f97803f55b21c0dd569caa4956f9.png)
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