数学Microsoft Word 文档 (2)
数学周清试题
一．填空：
1.(1). a m ·a n = (2). (a m )n = (3). (ab)n = [m,n 都是正整数]
(4).单项式与单项式相乘, (5).m(a+b+c)= (6).(a+b)(m+n)= (7).(a+b)(a-b)= (8).(a±b)2
= (9)a m ÷a n = [a≠0,m,n 都是正整数,且m>n] (10) 当x_______时，(x －4)0
等于______；
(11)单项式相除, . (12)多项式除以单项式, . 2. 64(310)(410)-???的值用科学记数法表示为_____________。 3. 522()()()________a a a -÷-÷-=。
4. 如果2(2)(3)x x x px q -+=++，那么______,______p q ==。 5若a2＋ma ＋9可以写成另一个多项式的平方，则 m = ____; 6. 已知x m =3,x n =4,求x 3m-2n =_________________。 7.已知a m =3,a n =2,则a 2m+3n = _____
8. 已知2232
(2)(36)3x x ax x x ----+中不含x 的三次项，则______.a = 二．计算：
1. 422222332
()()()()()()x x x x x x x x +-??--?-?- 2.(2a ＋5b) (5b – 2a)
3. 2
3
22
16()()3
x y a b xy b a -?--??+ 4. 2
2
32(2)()2
3
ab a a b -
--
5. (32)(3)(2)(3)a b b a a b a b ----+
6. 2
2
(2)(2)x y x y +--
7. (3)(9)(9)x y x y -++- 8.（2x 2y ）3·（-7xy 2）÷14x 4y 3
三．化简求值：
1.已知21117(2)(3)12,b c b ax y x y x y --=求a b c ++的值。
2. 2223()()()a b a ab b b b a a -++-+-，其中1,2a b =-=。
3. (2a –3b)(2a ＋3b) –(2a –b)2, 其中a= –1,
b= 0.5
4. x y x x y x y x y x 2)]2(2)2)(2()2[(2
÷--+-+- 其中 6,5-==y x
选做题：若210,n n +-=则32
22008_______.n n ++=
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【答案】D 【解析】特值法：（A ）取n x π=，有limsin 0,lim n n n n x x π→∞→∞ ==，A 错； 取1n x =-，排除B,C.所以选D. （4）微分方程的特解可设为 （A ）22(cos 2sin 2)x x Ae e B x C x ++ （B ）22(cos 2sin 2)x x Axe e B x C x ++ （C ）22(cos 2sin 2)x x Ae xe B x C x ++ （D ）22(cos 2sin 2)x x Axe e B x C x ++ 【答案】A 【解析】特征方程为：2 1,248022i λλλ-+=?=± 故特解为：***2212(cos 2sin 2),x x y y y Ae xe B x C x =+=++选C. （5）设(,)f x y 具有一阶偏导数，且对任意的(,)x y ，都有(,)(,)0,0f x y f x y x y ??>>??，则 （A ）(0,0)(1,1)f f > （B ）(0,0)(1,1)f f < （C ）(0,1)(1,0)f f > （D ）(0,1)(1,0)f f < 【答案】C 【解析】(,)(,)0,0,(,)f x y f x y f x y x y ??>
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全国至自学考试英语二历年真题及答案全集精编WORD版
全国至自学考试英语二历年真题及答案全集精 编W O R D版 IBM system office room 【A0816H-A0912AAAHH-GX8Q8-GNTHHJ8】
2014年4月高等教育自学考试全国统一命题考试 英语（二）试题答案及评分参考 第一部分：阅读选择（第1-10题，每题1分，共10分） 1.A 2.B 3.C 4.A 5.C 6.A 7.B 8.C 9.B 10.A 第二部分：阅读判断（第11-15题，每题2分，共10分） 11.C 12.A 13.A 14.D 15.B 第三部分：概括段落大意和补全句子（第16-25题，每题1分，共10分）16.C 17.B 18.A 19.D 20.F 21.D 22.F 23.B 24.C 25.A 第四部分：填句补文（第26-30题，每题1分，共10分） 26.F 27.A 28.C 29.B 30.D 第五部分：填词补文（第31-40题，每题1分，共10分） 31.G 32.K 33.I 34.J 35.A 36.B 37.L 38.D 39.H 40.E
第六部分：完型补文（第41-50题，每题1.5分，共15分） 41.planned 42.thoughs 43.worried 44.longer 45.really 46.unclear 47.behviour 48.done 49.hidden 50.easily 绝密★启用前 2014年10月高等教育自学考试全国统一命题考试 英语（二）试题答案及评分参考 （课程代码00015） 第一部分：阅读判断（第1~10题，每题1分，共10分） 1、B 2、B 3、A 4、C 5、B 6、C 7、A 8、A 9、B 10、A 第二部分：阅读选择（第11~15题，每题2分，共10分） 11、D 12、A 13、C 14、B 15、A 第三部分：概括段落大意和补全句子（第16~25题，每题1分，共10分） 16、C 17、D 18、A 19、B 20、F 21、D 22、F 23、E 24、A 25、C
2019年考研数学二真题及答案
考研数学二真题及答案 一、选择题：1~8小题，每小题4分，共32分。下列每题给出的四个选项中，只有一个选 项是符合题目要求的. 1 若1) (lim 2 12 =++→x x x bx ax e ,则（ ） A 1,21-== b a B 1,21 -=-=b a C 1,21==b a D 1,2 1 =-=b a 2下列函数中不可导的是（ ） A. )sin()(x x x f = B.)sin()(x x x f = C. x x f cos )(= D.) cos()(x x f = 3设函数?? ? ??≥-<<--≤-=???≥<-=0 011 ,2)(0,10,1)(x b x x x x ax x g x x x f 若) ()(x g x f +在R 上连续，则（ ） A 1 ,3==b a B 2 ,3==b a C 1 ,3=-=b a D 2 ,3=-=b a 4 设函数 ) (x f 在 ] 1,0[上二阶可导，且 )(1 =? dx x f 则 （ ） A 当0 )(<'x f 时，0)21(