2020届长郡中学高三第3次月考试卷-理数试卷及答案

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四川省绵阳市2018届高三第一次诊断性考试英语试卷(含答案)

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高三月考文科数学试卷

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A ．23)(x x x f += B 5()15x f x n x -=+C ．x x x f cos sin )(+=D ．x x e e x f -+=)( 9.已知一个几何体的三视图及有关数据如图所示,则该几何体的体积为() A.233C. 4323 10.设123,,e e e →→→ 为单位向量，且31212 e e k e → → →=+，）（0>k ，若以向量12,e e →→ 为两边的三角形的面积为 1 2 ，则k 的值为( ) A 2 B 35 D 7 11.在△ABC 中，角A ，B ，C 的对边分别为a ，b ，c ，且2cos 2 A －B 2cos B －sin(A －B )sin B ＋cos(A ＋C )＝－3 5 ,a ＝42，b ＝5，则向量BA →在BC → 方向上的投影为（） A ．22 B ．22- C ．53 D ．5 3 - 12．设函数3()(33),(2)x x f x e x x ae x x =-+--≥-，若不等式()f x ≤0有解．则实数a 的最小值为（） A ．21e - B ．22e - C ．2 12e +D ．11e - 二、填空题 13.设D 为ABC ?所在平面内一点，,,3→ →→→→+==AC n AB m AD CD BC 则m n -= . 14.设），（20πα∈，若,54)6cos( =+πα则=+)122sin(π α . 15.函数x x y cos 3sin 4--=的最大值为 . 16.设函数)0(,2)22 ()(23>-++=x x x m x x f ，若对于任意的[1,2]t ∈,函数)(x f 在区间(,3)t 上总不是单调函数,则m 的取值范围是为 . 三、解答题： 17.（10分）已知幂函数2 422 )1()(+--=m m x m x f 在),0(+∞上单调递增，函数.2)(k x g x -=(1)求m 的值；(2)当]2,1[∈x 时，记)(),(x g x f 的值域分别为B A ,，若A B A =?，求实数k 的取值范围． 18.（12分）已知)cos ),2cos(2(x x π + =,))2 sin(2,(cos π +=x x ,

四川省绵阳市2018届高三第二次诊断性检测英语试题Word版含答案

第I卷（选择题，共100分) 第一部分听力（共两节，满分30分）回答听力部分时，先将答案标在试卷上。听力部分结束前，你将有两分钟的时间将你的答案转涂到答题卡上。第一节(共5小题；每小题1.5分，满分7.5分）听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题并阅读下一小题。每段对话仅读一遍。例：How much is the shirt? A. ￡ 19.15. B. ￡ 9.18. C. ￡ 9.15. 答案是C。 1. What does the man think of driving? A. Difficult. B. Easy. C. Wonderful. 2. How would the woman go downtown? A. By bus. B. By taxi. C. By subway. 3. How much time does the man still have to get there? A. About 15 minutes. B. About 30 minutes. C. About 45 minutes. 4. Where are the speakers? A. In a hospital. B. In the woman’s house. C. In a drug store. 5. What is the relationship between the two speakers? A. Husband and wife. B. Mother and son. C. Doctor and patient. 第二节（共15小题；每小题1.5分，满分22.5分) 听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。听第6段材料，回答第6、7题。 6. Where does Alex take his piano lesson? A. Near the post office. B. In front of a theater. C. Beside a bank.

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南昌市正大学校高三数学（文科）月考试卷一．选择题（本大题共12小题，每小题5分，共60分，在每小题给出的四个选项中，只有一项符合要求） 1．已知等差数数列{}n a 满足111n n n a a a ++= -,若12a =,*n N ∈2009a =( ) A ．3 B.2 C.-3 D.4 2．设n S 是等差数列{}n a 的前n 项和，若 3613s s =，则612 s s =（） A ．310 B. 13 C. 18 D. 19 3．等差数列{}n a 的公差0d <，且22 111a a =，则{}n a 的前n 项和n S 取得最大值时的项数n ( ) A ．5 B.6 C.5或6 D. 6或7 4. 已知n S 为等差数列{}n a 的前n 项和，若132:6:5n n a a ++=，则6321:n n S S ++等于（） A ．5:2 B. 6:5 C. 49:18 D. 9:13 5．已知两个等差数列{}n a 和{}n b 的前n 项和分别为n A 和n B ，且7453n n A n B n +=+，则使得n n a b 为整数的正整数n 的个数是（） A ．2 B.3 C.4 D.5 6．在正项等比数列{}n a 中,若24681032a a a a a ????=,则27281 log log 2 a a -=( ) A. 18 B. 16 C. 12 D. 14 7．若{}n a 是等差数列，首项，120052006200520060,0,0a a a a a >+>?<则使前n 项和0n S >成立的最大自然数n 是（） A ．4009 B.4010 C.4011 D.4012 8.方程2log (2)2x a x -=-有解，则a 的最小值为( ) A ．1 2 B.1 C.2 D.4 9．已知数列}{n a 的通项公式为中则}{,2003 2002 n n a n n a --= （） A 存在最大项与最小项，这两项和大于2 B 存在最大项与最小项，这两项和等于2 C 存在最大项与最小项，这两项和小于2 D 既不存在最大项，也不存在最小项 10．在ABC 中,依次tan ,tan ,tan A B C 成等差数列,则B 的取值范围是( ) A. 20,,323πππ????? ?????? B.50,,626πππ?????? ?????? C.,62ππ?????? D.,32ππ?? ???? 11．若一个数列前n 项和1 159131721(1)(43)n n S n -=-+-+-+???+--则152231S S S +-=( ) A ．80 B.76 C.-76 D.56 12．把数列依次按第一个括号一个数，第二个括号两个数，第三个括号三个数，第四个括号一个数，…循环分为（1），（3，5），（7，9，11），（13），（15，17），（19，21，23），（25），……则第50个括号内的各数之和为（） A ．98 B. 197 C. 390 D. 392 二．填空题（本大题共4小题，每小题4分，共16分，把答案填在题中横线上） 13. 设}a {n 是首项为1的正项数列, 且0a a na a )1n (n 1n 2 n 21n =+-+++),3,2,1n ( =, 则它的通项公式是=n a ____ _____ . 14.在一种细胞，每三分钟分裂一次（一个分裂为三个），把一个这种细胞放入一个容器内，恰好一小时把容器充满；若开始时间把九个这种细胞放入该容器内，那么细胞把容器充满时间为分钟 15．已知数列}{n a 中, n S 是前n 项和, 2(1)n n n S a =+-,则n a = 。 16．给出定义：若11 22 m x m - <≤+（其中m 为整数），则m 叫做离实数x 最近的整数，记作{}x ，即{}x m =。在此基础上有函数{}()f x x x =-()x R ∈。对于函数()f x ，现给出如下判断： ①函数()y f x =是偶函数；②函数()y f x =是周期函数；③函数()y f x =在区间]11 (,22 -上单调递增④函数()y f x =的图象关于直线1 2 x k =+ （k Z ∈）对称。则判断中正确的是三．解答题（本大题共4小题，共44分。解答应写出文字说明、证明过程或演算步骤） 17. 已知正数数列{}n a 满足1 1a =，且对一切自然数*n N ∈有2 112n n n a a S ++-=。（I ）求数列 {}n a 的通项公式；（II ）求证： 221 2 11a a ++ (21) 2n a +< 18.函数322 ()31(,)f x ax bx a x a b R =+-+∈在12,x x x x ==处取得极值，且122x x -=。（I ）若1a =，求b 的值，并求的单调区间；（II ）若0a >，求b 的取值范围。 19.已知数列{}n a 满足1 76 a =，n S 是{}n a 的前n 项和，点1(2,)n n n S a S ++在11()23 f x x = +的图象上。（I ）求数列 {}n a 的通项公式；（II ）若2 (),3n n n c a n T =-为n c 的前n 项和，* n N ∈，求n T 20.数列{}n a 满足10a =，22a =，22 2(1cos )4sin 22 n n n n a a ππ +=++，1n =，2，3，… （I ）求34,a a ，并求数列{}n a 的通项公式；（II ）设13k S a a =++…21k a -+， 24k T a a =+++…2k a +， *2()2k k k S W k N T = ∈+，求使1k W >的所有k 的值，并说明理由。附加题

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