当前位置:首页>文档>(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析

(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析

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(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析
(4.2)-25考研数学基础结课测试卷解析(数学一)_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(一、二)全年智达班_{2}--资料_{4}-基础阶段结课测试卷和解析

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25 考研数学基础结课测试卷解析(数学一) 一、选择题(本题共10小题,每小题5分,满分50分,每小题给出的四个选项中,只有 一项符合题目要求,把所选项的字母填在题后的括号内) x  x2  1、lim  =( ). x→∞(x−a)(x+b) (A) 1 (B) e (C)ea−b (D) eb−a 解 应选(C). 方法一:l x i → m ∞    (x−a x )( 2 x+b)    x = l x i → m ∞ e x⋅ln (x−a x )( 2 x+b) = 研 ex l → im ∞ x⋅ln (x−a x )( 2 x+b) , 其中又因为 x2  x2−(x−a)(x+b) x l → im ∞ xln (x−a)(x+b) = x l → im ∞ xln 考1 + (x−a)(x+b)  xx2−(x−a)(x+b) (a−b)x2+abx = lim   = lim = a − b, x→∞ (x−a)(x+b) 途 x→∞ (x−a)(x+b) 故原式极限为ea−b. 方法二: 高  x2  x (x−a)(x+b) −x  a −x  b −x lim  =lim   =lim1−  ⋅lim1+  =ea⋅e−b =ea−b 2. 不定积分 x→∞(x−a)(x+b) x→∞ x2  x→∞ x x→∞ x dx ∫ =( ). x + 3 x (A)3 x +ln|3 x +1|+C (B) 63 x +6ln|3 x +1|+C (C)2 x −33 x +66 x −6ln|1+ 6 x|+C (D) 36 xarctan6 x +C 解 应选(C). 由于2和3的最小公倍数是6,所以,令x=t6,则dx=6t5dt,于是 dx t3  1  ∫ =6∫ dt =6∫ t2 −t+1− dt =2t3−3t2 +6t−6ln1+t +C x + 3 x 1+t  1+t dx 再将t = 6 x带入上式得∫ =2 x −33 x +66 x −6ln|1+ 6 x|+C x + 3 x 3. 已知函数 f(x)满足∫ x f(t)dt =ex2 −1, 则∫ 1 xf′(2x)dx =( ). 0 0 17 1 7 1 5 1 5 1 (A) e4 + (B) e4 − (C) e4 + (D) e4 − 4 4 4 4 3 3 3 3 答案 A 2 2 解析 在已知等式中, 取x=2, 得∫ f(t)dt =∫ f(x)dx=e4 −1, 0 0 将已知等式两边对x求导, 得 f(x)=2xex2 . 令2x=u, 则 1 1 2 1 2 1 2 ∫ xf′(2x)dx = ∫ uf′(u)du = ∫ xf′(x)dx = ∫ xd[f (x)] 0 4 0 4 0 4 0 研 2 1 1 2 1 1 2 = xf (x) − ∫ f (x)dx = ×2f (2)− ∫ f (x)dx 4 4 0 4 4 0 0 考 8 1( ) 7 1 = e4 − e4 −1 = e4 + . 4 4 4 4 4.下列级数中发散的是( ) 途 ∞ sinn ∞ n−1 ∞ 1 1 ∞ 1 (A) ∑ ; (B) ∑ ; (C) ∑ ln(1+ ); (D) ∑(−1)n n2 2n+1 n n n n=1 n=1 n=1 n=1 高 解: 应选B sinn 1 对选项A,由 ≤ 及比较审敛法,该级数收敛; n2 n2 n−1 1 对选项B,由lim = 及级数收敛的必要条件,该级数发散; n→∞2n+1 2 1 1 1 ∞ 1 对选项C,由 ln(1+ )~ 及∑ 收敛,该级数收敛; n n n2 n2 n=1 对选项D,由莱布尼兹定理知,该级数收敛. 故选B.  1 −1 1   5. 设A= 2 4 a ,且 A的特征值为λ =6,λ =λ = 2.如果 A有三个线性无关的特   1 2 3   −3 −3 5 征向量,则a=( ). (A)2 (B)−2 (C)4 (D)−4 【解】因为三阶方阵A有三个线性无关的特征向量,而λ =λ =2为二重根,故该特征值对 2 3 应两个线性无关的特征向量,从而有R(A−2E)=1,而 2−1 −1 1 −1 −1 1      A−2E =  2 2 a  →  0 0 a+2  ,显然当a=−2时R(A−2E)=1,故选(B).     −3 −3 3  0 0 0  6. 若向量组α ,α ,,α 线性相关,则下列说法正确的是( ). 1 2 m (A)任何向量都可由其余向量线性表示 (B)去掉任一向量之后,仍线性相关 (C)某一向量可由其余向量线性表示 (D)添上一个向量以后,就会线性无关 解:根据相关组增加向量仍相关,(D)不正确;举特例 ,设线性相关向量组为 1 0 2 α = ,α = ,α = ,显然α 不可由其余向量表示,且去掉α 后线性无关,所以(A)、 1 0 2 1 3 0 2 3 (B) 也不正确,故选(C). 研 7. 设n阶实对称矩阵A正定的充分必要条件为( ). (A)R(A)=n (B)A的所有特征值非负 (C)A=CCT,(C 是n阶可逆矩阵) 考 (D)A的所有k阶子式都为正 1 0  【解】R(A)=n是A正定的必要不充分条件,例如设二阶实对称矩阵A= ,则满足 0 −1 途 R(A)=2,但A的特征值为1,−1,不正定,所以(A)错误;A的特征值非负,则A的特征值 可能为 0,当A有特征值0时,A不正定,所以(B)错误;如果A的所有k阶子式都为正, 高 则A正定;但如果A正定,则其左上角各阶顺序主子式都为正,未必保证所有k阶子式都为 正,所以(D)错误; 选项(C)正确,A=CCT 且C可逆,则CT 也可逆,则C−1A(CT)−1=C−1A(C−1)T =E ,令 (C−1)T =P,则 PTAP=E 即A与E合同,这是A正定的充要条件,所以选(C). 8.在下述函数中,可以作为某一随机变量的分布函数的是( ) 1 1 1 (A)F(x) = (B)F(x) = arctanx+ 1+ x2 π 2 1  (1−e−x), x >0 x +∞ (C)F(x) = 2 (D)F(x) = ∫ f(t)dt,其中∫ f(t)dt =1 −∞ −∞  0, x ≤0 解:应选B 由分布函数的性质,A,C不满足F(+∞)=1,对D,这里的 f(t)未必是非负的. 故选B. 9.设当事件A与B同时发生时,事件C必发生,则 3(A)P(C)≤P(A)+P(B)−1 (B)P(C)≥P(A)+P(B)−1 (C) P(C)=P(AB) (D) P(C)=P(A∪B) 解:应选B 由于已知得AB⊂C,而P(A)+P(B)−P(AB)=P(A∪B)≤1,故 P(C)≥P(AB)≥P(A)+P(B)−1.故选B 10.设随机变量X,Y 不相关,且EX =2,EY =1,DX =3,则E[X(X +Y −2)]=( ) (A)−3 (B)3 (C)−5 (D)5 解:应选D 由数学期望的性质,以及期望和方差的运算关系,得: 研 E[X(X +Y −2)]=EX2 +EXY −2EX =DX +(EX)2 +EXY −2EX 又量X,Y 不相关,则有EXY =EX ⋅EY ,代入得:E[X(X +Y −2)]=5,故选D. 二、填空题(本题共6小题,每小题5分,满分30分,把答案填在题中横线上) 考 n k  k  11.lim∑ ln1+  = __________. n→∞ n2  n k=1 途 1 解:应填 4 根据定积分的定义有: 高 lim∑ n k ln  1+ k  =lim 1 ∑ n k ln  1+ k  =∫ 1 xln ( 1+x ) dx n→∞ n2  n n→∞n n  n 0 k=1 k=1 1 = 1 ∫ 1 ln ( 1+x ) d ( x2 ) = 1 x2ln ( 1+x ) − 1 ∫ 1 x2d ( ln ( 1+x )) 2 0 2 2 0 0 ( ) 1 1 1 1 1 1 1 x2 −1 +1 = ln2− ∫ x2 dx= ln2− ∫ dx 2 2 0 1+x 2 2 0 1+x 1 = 1 ln2− 1 ∫ 1   x−1+ 1   dx= 1 ln2− 1  1 (x−1)2 +ln(x+1)   2 2 0 1+x 2 22  0 1 = . 4 12.微分方程ydx+(x−3y2)dy =0满足条件y =1的解为 . x=1 解:应填y = x 4dx x 由题意知 ydx=(3y2 −x)dy ,所以 + =3y 为一阶线性微分方程,所以通解为 dy y xy = y3+C,代入x=1,y =1可以得到C =0,所以x= y2. 由 y =1得y = x . x=1 13.若函数z = z(x,y)由方程ez +xyz+x+cosx=2确定,则dz = . (0,1) 解:应填−dx 令F(x,y,z)=ez +xyz+x+cosx−2,则F' = yz+1−sinx,F' = xz,F' =ez +xy, x y z ∂z F' ∂z F' 又当x=0, y =1,z =0,此时有 =− x =−1, =− y =0, ∂x F' ∂y F' (0,1,0) z (0,1,0) z 研 所以dz =−dx. (0,1) 14. 已知曲线L:y = x2(0≤ x ≤ 2),则∫ xds= . L 解:由题意可知 考 2 2 1 2 ∫ xds=∫ x 1+[(x2)′]2dx=∫ x 1+4x2dx= ∫ 1+4x2d(1+4x2) L 0 0 8 0 1 2 3 13 = ⋅ (1+4x途 2)2 | 2= . 8 3 0 6 15. 二次型 f(x,x ,x )=x2 +x2 +x2 +2xx 的正惯性指数为 . 1 2 3 1 2 3 1 2 解: 高 二次型的化为 f(x,x ,x )=(x +x )2 +x2 ,即利用配方法可得到它的一个标准形为 1 2 3 1 2 3 f = y2 + y2,所以正惯性指数等于2. 1 2 16. 袋中有8个球,其中有3个白球5个黑球,现从中任取4个球,如果4个球中2个 白球 2 个黑球,试验停止,否则将 4 个球放回袋中,重新抽取 4 个球,直到出现 2 个白球2个黑球为止,用X 表示抽取次数,则P{X =k}=__________(k =1,2, ). 解: 记 A = “第i 次取出 4 个球为 2 白 2 黑”,由于是有放回取球, 因而 A 相互独立,则 i i P(A)= C 3 2C 5 2 = 3 ,所以P{X =k}=P { AA A } =  1− 3   k−1 ⋅ 3 = 4   k−1 3 (k =1,2, ). i C4 7 1 k−1 k  7 7 7 7 8 三、解答题(本题共6小题,满分70分. 解答应写出文字说明、证明过程或演算步骤) 17. (本题满分10分) 讨论方程xlnx=k 在(0,+∞)内根的个数. 解: 5令 f(x)= xlnx−k,x∈(0,+∞), 则 f′(x)=lnx+1,令 f′(x)=0, 得驻点x=e−1, 当 x >e−1 时 f′(x)>0; 当 0< x0,即k <− ,则方程xlnx=k 在(0,+∞)内根的个数0个. e 高e 18. (本题满分12分) ∂z ∂z ∂2z 设函数 f,g均二阶可微,设z= f [xy,lnx+g(xy)],计算 , , . ∂x ∂y ∂x∂y 【解】 ∂z 1  ∂z = f ′⋅y+ f ′⋅ + yg′(xy), = f ′⋅x+ f ′⋅g′(xy)x. ∂x 1 2 x  ∂y 1 2 . ∂2z 1  = f ′+ y [ xf′′+ f′′⋅xg′(xy) ]+ + yg′  [ xf′′+ f′′⋅xg′(xy) ]+(g′+xyg′′) f′ ∂x∂y 1 11 12 x  21 22 2 19.(本题满分12分) 设曲面Σ:z = 4−x2 − y2 的上侧,求曲面积分∫∫xydydz+ xdzdx+ x2dxdy. Σ 解:加Σ :z =0(x2 + y2 ≤4)的下侧,记Σ与Σ 所围空间区域为Ω,则由高斯公式可得 1 1 ∫∫xydydz+xdzdx+x2dxdy Σ 6= ∫∫ xydydz+xdzdx+x2dxdy−∫∫xydydz+xdzdx+x2dxdy Σ+Σ Σ 1 1 1 =∫∫∫ ydxdydz−(− ∫∫ x2dxdy)=0+ ∫∫ (x2 + y2)dxdy 2 Ω x2+y2≤4 x2+y2≤4 1 2π 2 = ∫ dθ∫ r3dr =4π 2 0 0 20.(本题满分12分) 设 f(x) , g(x) 在区间 [−a,a](a>0) 上连续, g(x) 为偶函数,且 f(x) 满足条件 f(x)+ f(−x)= A(A为常数), 1 π 研 (1)证明:当x≠0时,arctanx+arctan = 恒成立. x 2 (1)证明:∫ a f(x)g(x)dx= A∫ a g(x)dx −a 0 考 π (2)计算定积分∫ 2 sinx arctanexdx π − 2 1 解:(1)令h(x)=arctanx+a途rctan ,(x≠0),则 x 1 1  1  1 1 h′(x)= + − = − =0, 1+x2 1  x2  1+x2 1+x2 1+ x2 高 π π 所以h(x)为一常数.而h(1)=arctan1+arctan1= ,所以h(x)= 恒成立. 2 2 (2)∫ a f(x)g(x)dx=∫ a [f(x)g(x)+ f(−x)g(−x)]dx,因为g(x)为偶函数,所以g(−x)=g(x), −a 0 所以 ∫ a f(x)g(x)dx=∫ a [f(x)+ f(−x)]g(x)dx= A∫ a g(x)dx. −a 0 0 π (3)取 f(x)=arctanex,g(x)= sinx ,a= 2 π 且 f(x)+ f(−x)=arctanex +arctane−x = , 2 π π π π 所以∫ 2 sinx arctanexdx= ∫ 2 sinxdx= π − 2 0 2 2 21. (本题满分12分) 1  1   −1   1          设向量组A:α 1 =  2  ,α 2 =  a+2  ,α 3 =  −b−2  ,及向量β=  3  ,问a,b何值时?         0  −3a  a+2b −3 7(1)向量β能由A线性表出且表法唯一; (2)向量β不能由A线性表出; (3)向量β能由A线性表出,且表法不唯一,并求一般表达式. 解: 设β = xα +xα +xα . 1 1 1 2 2 3 3 对方程组增广矩阵进行初等行变换. 1 1 −1 1  1 1 −1 1  研 ( )     A= α,α,α β = 2 a+2 −b−2 3 → 0 a −b 1 1 2 3         0 −3a a+2b −3 0 −3a a+2b −3     1 1 −1 1 考   →  0 a −b 1 .   0 0 a−b 0   (1)当a ≠b,a ≠0时r ( A 途 )=r ( A ) =3方程组有唯一解,且 1 1  1 1 x =0,x = ,x =1− ,β= 1−  α + α . 高 3 2 a 1 a  a 1 a 2 (2)当a =0,∀b,r ( A )≠r ( A ) ,方程组无解,即β不能由α,α,α 线性表出. 1 2 3 (3)当a ≠0,a =b时,r ( A )= r ( A ) =2<3.此时,方程组有无穷多解. 1 1 −11   1 1 A→0 a −a1,令x =t,得:x =t+ ,x =1− .   3 2 a 1 a 0 0 0 0    1  1 ∴β=1− α +t+ α +tα ,t为任意常数.  a 1  a 2 3 22. (本题满分12分) Ax(1−x)3, 0≤ x≤1 设随机变量X 的概率密度为 f(x)= . 0, 其它 (1) 求常数A; (2) 求X 的分布函数; (3) 求Y = X3的概率密度. 8解: (1) 由概率密度的性质,得 1 A ∫ Ax(1−x)3dx= =1, 0 20 故A=20. 研 (2) 当x<0时,F(x)=0; x 当0≤ x<1时,F(x)=∫ 20t(1−t)3dt =(−4x3+15x2 −20x+10)x2; 考 0 当x≥1时,F(x)=1. 0, x<0 途  综上,F(x)=(−4x3 +15x2 −20x+10)x2, 0≤ x<1.  1, x≥1  高1 (3) y= x3单调递增,其反函数为x= y3,0< y<1,因此,Y = X3的概率密度为  1 1 20 − 1 1  f (y3)(y3)′, 0< y<1  y 3(1− y3)3, 0< y<1 f (y)= X = 3 Y .  0, 其它  0, 其它 9
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  1. 请求信息 : 2026-02-27 02:29:23 HTTP/1.1 GET : https://www.yeyulingfeng.com/wendang/327428.html
  2. 运行时间 : 0.097181s [ 吞吐率:10.29req/s ] 内存消耗:4,783.31kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=0cec8280c693d0053e3846bf772b88ee
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  1. CONNECT:[ UseTime:0.000539s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000775s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000319s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000462s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000519s ]
  8. SELECT * FROM `wendang` WHERE `id` = 327428 LIMIT 1 [ RunTime:0.000418s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 327428 [ RunTime:0.010187s ]
  10. UPDATE `wendang` SET `lasttime` = 1772130564 WHERE `id` = 327428 [ RunTime:0.000566s ]
  11. SELECT * FROM `wendang` WHERE `id` < 327428 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000459s ]
  12. SELECT * FROM `wendang` WHERE `id` > 327428 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000370s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 327428 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001287s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 327428 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000946s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 327428 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002165s ]
0.098814s