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2020考研数学二真题_26.考研数学(一)(二)(三)真题_26.2考研数学(二)真题_版本2自选使用_01.1987-2024年数二真题合集

  • 2026-03-01 12:42:39 2026-02-23 17:47:34

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2020考研数学二真题_26.考研数学(一)(二)(三)真题_26.2考研数学(二)真题_版本2自选使用_01.1987-2024年数二真题合集
2020考研数学二真题_26.考研数学(一)(二)(三)真题_26.2考研数学(二)真题_版本2自选使用_01.1987-2024年数二真题合集
2020考研数学二真题_26.考研数学(一)(二)(三)真题_26.2考研数学(二)真题_版本2自选使用_01.1987-2024年数二真题合集

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2020 年数二真题 一、选择题 (1) 当 x→0+ 时,下列无穷小量中阶最高的是 ( ) (cid:1) (cid:1) √ (cid:1) (cid:1) √ (A) x (et2 −1)dt. (B) x ln(1+ t3)dt. (C) sinx sint2dt. (D) 1−cosx sin3tdt. 0 0 0 0 1 (2) 函数 f(x)= ex−1 ln|1+x| 的第二类间断点的个数为 ( ) (ex−1)(x−2) (A)1 个. (B)2 个. (C)3 个. (D)4 个. (cid:1) √ (3) 1 √arcsin xdx=( ) 0 x(1−x) (A)(cid:25)2. (B)(cid:25)2. (C)(cid:25). (D)(cid:25). 4 8 4 8 (4) 已知函数 f(x)=x2ln(1−x),当 n≥3 时,f(n)(0)=( ) (A)− n! . (B) n! . (C)−(n−2)!. (D)(n−2)!. n−2  n−2 n n  xy, xy ̸=0, (cid:12) (cid:12) (cid:12) (cid:12) (5) 关于函数f(x,y)= x, y =0, 给出下列结论:⃝1 @f(cid:12) =1;⃝2 @2f (cid:12) =1;⃝3 lim f(x,y)=  @x (0;0) @x@y (0;0) (x;y)→(0;0) y, x=0, 0;⃝4 lim limf(x,y)=0. 其中正确的个数为 ( ) y→0x→0 (A)4. (B)3. (C)2. (D)1. (6) 设函数 f(x) 在区间 [−2,2] 上可导,且 f′(x)>f(x)>0,则 ( ) (A)f(−2) >1. (B) f(0) >e. (C) f(1) 0) 的斜渐近线方程. (1+x)x (cid:1) (16) 已知函数 f(x) 连续且 lim f(x) =1,g(x)= 1 f(xt)dt,求 g′(x) 并证明 g′(x) 在 x=0 处连续. x→0 x 0 (17) 求函数 f(x,y)=x3+8y3−xy 的极值. ( ) (18) 设函数 f(x) 的定义域为 (0,+∞) 且满足 2f(x)+x2f 1 = √x2+2x. 求 f(x),并求曲线 y =f(x), x 1+x2 √ y = 1,y = 3 及 y 轴所围图形绕 x 轴旋转所成旋转体的体积. 2 2 √ (cid:3) (19) 设平面区域 D 由直线 x=1,x=2,y =x 与 x 轴围成. 计算 x2+y2 dxdy. x (cid:1) D (20) 设函数 f(x)= x et2dt. 1 (I) 证明:存在 ξ ∈(1,2),使得 f(ξ)=(2−ξ)e(cid:24)2. (II) 证明:存在 η ∈(1,2),使得 f(2)=ln2·ηe(cid:17)2. (21) 设函数 f(x) 可导,且 f′(x) > 0,曲线 y = f(x)(x ≥ 0) 经过坐标原点 O,M 为其上任意一点, 点 M 处的切线与 x 轴交于点 T,又 MP 垂直 x 轴于点 P. 已知由曲线 y =f(x),直线 MP 以及 x 轴 所围图形的面积与 △MTP 的面积之比恒为 3:2,求满足上述条件的曲线方程.   x  1   (22) 设二次型 f(x 1 ,x 2 ,x 3 ) = x2 1 +x2 2 +x2 3 +2ax 1 x 2 +2ax 1 x 3 +2ax 2 x 3 经过可逆线性变换 x 2 = x   3 y  1   P y 2 化为二次型 g(y 1 ,y 2 ,y 3 )=y 1 2+y 2 2+4y 3 2+2y 1 y 2 . y 3 (I) 求 a 的值. (II) 求可逆矩阵 P. (23) 设 A 为 2 阶矩阵,P =((cid:11),A(cid:11)),其中 (cid:11) 是非零向量且不是 A 的特征向量. (I) 证明 P 为可逆矩阵. (II) 若 A2(cid:11)+A(cid:11)−6(cid:11)=0,求 P−1AP,并判断 A 是否相似于对角矩阵.2020 年真题参考答案 一、选择题 . (1)D. (2)C. (3)A. (4)A. (5)B. (6)B. (7)C. (8)D 二、填空题 - . 2 - . - x - y. 1 ρga3. . a4 - a2. (9) 2 (10) (2 2 1) (11)(π 1)d d (12) (13)1 (14) 4 9 3 三、解答题 x 斜渐近线方程为y = + 1 . (15) e 2e x ì ïxf x - f u u ïï ( ) ∫ 0 ( )d x g′ x = í x2 , ≠0, 证明略. (16) ( ) ï ï î1 x = . , 0 2 ( ) 极小值f 1 1 = - 1 . (17) , 6 12 216 f x = x .旋转体体积为π 2 . (18) ( ) + x2 6 1 3 + + . (19) [ 2 ln( 2 1)] 4 证明略. (20) y = Cx3 其中C为任意正常数. (21) , a = - 1 . (22) (Ⅰ) 2 æ ö 2 ç1 2 ÷ æx ö æy ö ç 3÷ ç 1÷ ç 1÷ P = ç ÷ 可逆线性变换 çx ÷ = P çy ÷ 可将二次型 f x x x 化为二次型 (Ⅱ) ç ç 0 1 4 ÷ ÷ , è ç x 2 ø ÷ è ç y 2 ø ÷ ( 1, 2, 3) 3 è ø 3 3 0 1 0 g y y y . ( 1, 2, 3) 证明略. (23) (Ⅰ) æ ö æ ö P- 1AP = ç0 6 ÷ A相似于对角矩阵ç2 0 ÷ . (Ⅱ) è - ø, è - ø 1 1 0 3 — 5 —
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  1. CONNECT:[ UseTime:0.000799s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000749s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000452s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000570s ]
  8. SELECT * FROM `wendang` WHERE `id` = 325035 LIMIT 1 [ RunTime:0.000414s ]
  9. UPDATE `wendang` SET `liulancishu` = 7 WHERE `id` = 325035 [ RunTime:0.002562s ]
  10. UPDATE `wendang` SET `lasttime` = 1772391356 WHERE `id` = 325035 [ RunTime:0.000460s ]
  11. SELECT * FROM `wendang` WHERE `id` < 325035 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001235s ]
  12. SELECT * FROM `wendang` WHERE `id` > 325035 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000587s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 325035 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001108s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 325035 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004173s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 325035 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001953s ]
0.136870s