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2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解

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2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解
2023考研数学二真题答案解析_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_02.1987-2024年数二真题详解

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2023年数学(二)真题解析 一、选择题 (1)【答案】(B). 【解】由 ln(e H-----)— 1 In 1 + —~37TT lim ^- = l,lim(y-x) = lim-----------------------= lim —~潺二 1) 2_ J-»0O 工 J-»OO 工―8 ] 工―8 e 7 7 得曲线的斜渐近线方程为、=工+土,应选(B). e (2) 【答案】(D). 【解】当工$0时, F愆)=[ = ln(\/x2 + 1 + 工)+ C1 ; J 71+x2 当了> 0时, F (工)=J(x + l)cos x dx = (x + l)sin x + cos x + C2» 因为 F(工)在 x =0 处连续,所以 F(0 — 0) =F(0) = F(0 + 0),取 C2 = 0,则 G = 1, 故 ln( Jz 2 + 1 + 0, 选(D). (3) 【答案】(B). 【解】 由题意得z” > 0,再由xb+1 =sin z” W z”得}单调递减,则limz”存在, “f 8 令limx" = A ,由 A = sin A 得 A = 0,即limz„ =0; ”-*8 n~»8当;I,丰Xi为实数时,通解v=Ge”' +C2e2X在(一 OO , + OO) 上无界; 当;11 =A2为实数时,通解y=(Ci +C2x)ei,x在(一8,十8)上无界; 当 A lt2 =a 士 i。且。尹 0 时,通解 y =eax (Geos 伙r + C2sin fix )在(一00> + °°)上无界‘ [a =0, 故 即a =0,6 >0,应选(C). la2 -46 <0, (5)【答案】(C)・ 【解】2=0时,z=0,、=0, t 得 V = — 1 sin z ; y = — i sin t, —xsin x » z V 0, (x =3i, T T 当 ^2。时,z>0,由 得、=〒sin即:y =< \y =Zsin 19 3 3 fsin § z 2 0, o O 由 iim 火).一些=lim 川)一冲=0 得y(0)=05 x-0~ X x-0+ X 当1 VO时, yf = — sin x — x cos x ; 当z >0时, , 1 . X . X X y =1^皿司+亏cos耳, 即 —sin x — xcos x > x < 0, 因为 lim;y'(z ) = limy^x ) =yr(0) = 0,所以 yf(x )在 x ==0 处连续; •r-*。— x-*0+ 因为 /'&)—/(0) 9 , r >Z(X)—^'(O) 2 lim ------------------= — 2 尹 lim ---------------------=— x-»o— z x-»o+ 二X 9 所以r(o)不存在,选(o. (6)【答案】(A). 【解】g =『Tin K-Blnz) = j:;L& J_ .广广(in 2)~° a I in 2 a 由 2023年数学(二)第7页(共14页)_f(a) =一(In 2)f • Indn 2)-------- =0 1 得一和方'选(A)。 (7)[答案】(C). 【解】(x ) = (x2 + 2x + a ) ex ,因为f (工)没有极值点,所以x2 +2x + a 2。,即乙= 4 一 4a W 0,即 a 2 1 ; ) = (x2 + 4jc + a + 2 ) ex ,因为曲线 y =f(x )有拐点,所以 16 — 4(q+2) >0,即 q V2,故 1 <2,选(C). (8)【答案】 (D). E 【解】 =1 A |・| B I,令 O B E\T *】】X12 O B X21 X22* 由 E X E O O B X O E AX】】 +EX21 =E, XH =A-1, AX】? +EX22 =O, x12=-a~ B1 得] 解得】 '则 BX2i =O, x2l =0, BX 22 = E , X22=B', /A E\ * -71 — A , B * \ ==1 A | • | B | 1 A | ' \o \ 0 选(D). 1 -1(10)【答案】(D). 【解】 令 y = 4 ] a 1 +互2。2 = —,1P I — I 2。2,或龙 1 a 1 + & 2。2 + + I 2。2 =。, 由 Z1 2 2 1\ /I 2 2 1 /I 0 0 -3\ 2 1 5 0 ——► 0 -3 1 -2 0 1 0 ‘0 11 J 1 9 1 -1 0 '0 0 1 ki 3 3互 如 _ 1 -k 得 —L ,故 —K -1 -k 1" .1 k . A I2} y = 3ka! —ka2 =邱】—kp2 =3A 2 —k 1 2 5 以 6 R), V V V 选(D). 二、填空题 (11)[答案】 -2. 【解】 由 111(1+])=]— *- + 寻+。(]3)得 乙 «5 (。-§)工 2 + 寻 + °(H 3 ); /(x ) = (a + l)x + 2 o 由 ex2 = 1 + Z 2 + o (z 3 ) , cos X =1 —号 + 0(]3)得 g(x ) = —X 2 + 0(1 3 ), 乙 乙 1 3 再由 /(x )〜g(z )得 a = — 1,6----=或,即 a = — l,b =2,故沥=—2. (12)[答案】苧+0 0 【解】 显然x e L-V3,V3],曲线段的长度为 i =伫 yi+T^dx =伫 J =-2sin£ 2 3 4cos2idi J 0 =4『(1 + cos 2[)血=挡 + 2 .卓=栏 + V3. J o o Z o _3_ (13)【答案】 ~~2 【解】 当x = \yy = 1得^=0,e€ + xz =2x —两边对z求偏导得 dz 3z e‘ • 3- + 2+Z —=2 ox dx 2023年数学(二)第9页(共14页)代入得方I =1; ox I (1,1) ex •祭+ z+ z容=2两边对x求导得 ox ox d2 z dz 32 z +「F+2 淳 +f=°, d2z 3 代入得Y ox (1,1) 2 (14)【答案】—号. 【解】1=1代入得、=1,3工3=疣+2、3两边对]求导得 M 2 =(5^4 + 6/)股, or 代入得£L=1 =号,故曲线在工=i对应点处的法线斜率为一?・ (15)[答案】 y. 【解】 由 /(x 4-2)—/(x)=x 得/(x + 2)~/(x)+^,则 J /(x)dx =J f{x )dx +1 /(x )dx + J f (x )dx =—[/(x )dx + f /(x )dj: = — f /(x )dj? + [ /(x + 2)dr J 0 J 2 J 0 J 0 =—f /(x)dx + f /(x )dx + f xdx =[・ Jo Jo Jo Z (16)[答案】8. 0 1 1 - 1 a 1 0 _ 【解】A = ,因为原方程组有解,所以r(A)=r(A) <3<4, 1 2 a 0 6 0 2 从而| A | = 0, 由 0 1 1 1 a 1 a 0 1 1 a 1 a 1 0 1 2 q +2 1 a 1 =8 — 12a =0 2 a 0 a b 0 1 2 a a b 0 b 0 2 1 Q 1 得 1 2 a =8. a b Q 2023年数学(二)第10页(共14页)三、解答题 (17)【解】(1)切线方程为丫一 v =/(X —1),在 > 轴上的截距为Y = v — z:/,由题意得 y — xy' =x,整理得 yr —y = — 1,解得 x y = J(- 1) J 7dr dx + c] e,X^ 时,S'(z) > 0. 故工=/时,三角形面积最小,最小面积为S(e§)=e3. +z =0, OX (18)[解】由< 得 ? = — x e009y sin jz =0, dy —e x = — e, 及 M Z, y = C2k + 1)k y = , = 19 ' [ = — e008 y • sin y , —= x e008 y • sin2j/ — x eCO8> • cos y , =— dx 3 工 dy 当(3)= (— e-,,(2i + l)K)时,A =1,B =0,C=-e~2 因为AC — B? < 0,所以& ,/)=(- e'\C2k + l)n)不是极值点; 当(C)= (— e,2D 时,A =1,B = 0,C = e2, 因为AC — B,> 0且A >0,所以(x,>)=(-e,2^7t)(^ E Z)为函数的极小值点,极小 e2 值为 /*(—e,2D=—万. (19)【解】(1)D的面积为 7 sec" dt = A = :esc tdt f sec Ztan t x v 1 + x =In | esc t — cot t | :=—ln(^ — 1) = ln(l +42}. (2)D绕工轴旋转所成的旋转体的体积为 2023年数学(二)第11页(共14页)V = C ^71^75=/「(土 一土)dzW—arctandreXl _ j). (20)【解】如图所示,令 20题图 x =rcos 0, 1 o
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  1. CONNECT:[ UseTime:0.000669s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000835s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000355s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000648s ]
  6. SELECT * FROM `set` [ RunTime:0.000244s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000754s ]
  8. SELECT * FROM `wendang` WHERE `id` = 325053 LIMIT 1 [ RunTime:0.004832s ]
  9. UPDATE `wendang` SET `liulancishu` = 6 WHERE `id` = 325053 [ RunTime:0.000803s ]
  10. UPDATE `wendang` SET `lasttime` = 1772279336 WHERE `id` = 325053 [ RunTime:0.000599s ]
  11. SELECT * FROM `wendang` WHERE `id` < 325053 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006038s ]
  12. SELECT * FROM `wendang` WHERE `id` > 325053 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000869s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 325053 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001317s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 325053 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000937s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 325053 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000893s ]
0.086491s