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经验超市26考研7月数一月考卷_06.2026考研数学俞老全程班_00.书籍讲义_经验超市月考卷

  • 2026-03-10 00:05:14 2026-02-25 01:29:06

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经验超市26考研7月数一月考卷_06.2026考研数学俞老全程班_00.书籍讲义_经验超市月考卷
经验超市26考研7月数一月考卷_06.2026考研数学俞老全程班_00.书籍讲义_经验超市月考卷
经验超市26考研7月数一月考卷_06.2026考研数学俞老全程班_00.书籍讲义_经验超市月考卷
经验超市26考研7月数一月考卷_06.2026考研数学俞老全程班_00.书籍讲义_经验超市月考卷

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经验超市26考研7月月考卷.数一 一、选择题 (5分/题,共50分) 1.当x0时, x 与 x 都是非 0 无穷小量,给出以下四个命题中正确的是   . (A)如果2 x  2 x ,则 x   x   B 如果3 x  3 x ,则 x   x   C 如果   x  x   0,则 x   x   D 如果 x   x ,则 x  x o  x  2.设 f(x)有二阶导数,且 f(x)0, f(x)0 ,又y  f (xx) f (x),则当x0时, 有  . (A)y dy 0; (B)y dy 0; (C)dy y 0; (D)dy y 0; 3.设u  xlnyez,求gradu|   . (1,1,0) (A)(1,1,1) (B)(0,1,1) (C)(1,0,1) (D)(1,1,0) 4.设 f(r),g(r)连续,又满足 f(0)0, f (0)3,g(0)1,(t) 为区域:  f( x2  y2)g(z)dV x2  y2 t2,t  z t,t 0,则I  lim (t)    . t0 t4 (A) (B)2 (C)3 (D)4 5.设A为n阶矩阵,满足AAT  E, A 0,则 AE =    A  1  B 1  C  2  D  0 6.若方程组AX 的所有解均为方程组BX 的解,则  A 矩阵A A,的列向量组可以由矩阵B  B,的列向量组线性表示经验超市26考研7月月考卷.数一  B 矩阵B  B,的列向量组可以由矩阵A A,的列向量组线性表示  C 矩阵A A,的行向量组可以由矩阵B  B,的行向量组线性表示  D 矩阵B  B,的行向量组可以由矩阵A A,的行向量组线性表示 7.当满足______时,二次型 f (x2 y2z2)2xy2yz2xzw2 正定. (A)02 (B)2 (C)2 (D)0 1 1 8. 设事件A,B相互独立,P(B) ,P(AB) ,则P(BA)  . 3 2 1 3 1 1 (A) (B) (C) (D) 12 4 4 6 2 3 2    9.设X 为随机变量,则下列哪种情况能使得A 0 2 X 的特征值全为实数的概率     0 1 0  为0.5         B X  B 2,0.5 A X U 0,2 .         C X  E 1 . D X  N 0,1 10.设X ,X ,,X 为来自总体X 的简单随机样本,D  X 2 0,X 为样本均值,则 1 2 n X X 与X 的相关系数为 n 1 1  A 1  B  0  C   D  1n n1 二、填空题(5分/题,共30分) 11.当x0时,3x4sinxsinxcosx 与xn为同阶无穷小量,则n ____. x 12.求微分方程 ysec2 y tan y  x,y(0)0满足初始条件的特解。 1x2经验超市26考研7月月考卷.数一  1 13.设级数a ln n(a 0),当a  _____时,级数收敛. n1 14.求曲线 y2 2mx,z2 mx在点M(x ,y ,z )处的切线及法平面方程。 0 0 0 15.设A是三阶可逆矩阵,如果A1的特征值为1,2,3,则 A 的代数余子式 A  A  A  _____。 11 22 33 16.设5个乒乓球中有3个黄球,2个白球,将其随机放入编号为1,2,3,4,5的5个盒子中, 一个盒子放入一个球,现从第1号盒子开始逐个打开,直到出现两个黄球为止,记X 为所打 开的盒子数,则P  X 3  ______. 二、解答题 x3 3x2 17.(10分)求曲线y  arctanx的所有渐近线 x2 1 18.(12分)求抛物线 y2 4x与直线 y 2x4所围成的均匀薄片的形心  x2n  1 19.(12分)求幂级数 的收敛区间与和函数,并求级数 的和。 2n1 (2n1)2n n1 n1 20.(12分)设L为圆周(x1)2  y2 2(逆时针方向),计算曲线积分 (x y)dx(x y)dy  。 L x2  y2 21.(12分)设A是3阶实对称矩阵,各行元素之和均为0,且R(2EA)2,A3E 不可 逆. (1)XTAX 1表示什么样的二次曲面?为什么?(5分) (2)求伴随矩阵A*.(7分)经验超市26考研7月月考卷.数一 22.(12分) 设X U  0,,求 (1)Y sinX 的概率密度(8分) (2)E  Y 和D  Y  (4分)
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  1. CONNECT:[ UseTime:0.000460s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000589s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000340s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000490s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000637s ]
  8. SELECT * FROM `wendang` WHERE `id` = 326197 LIMIT 1 [ RunTime:0.002173s ]
  9. UPDATE `wendang` SET `liulancishu` = 10 WHERE `id` = 326197 [ RunTime:0.003474s ]
  10. UPDATE `wendang` SET `lasttime` = 1773112884 WHERE `id` = 326197 [ RunTime:0.000414s ]
  11. SELECT * FROM `wendang` WHERE `id` < 326197 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000404s ]
  12. SELECT * FROM `wendang` WHERE `id` > 326197 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003131s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 326197 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001355s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 326197 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001652s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 326197 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001114s ]
0.086745s