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2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析

  • 2026-03-01 12:31:27 2026-02-23 17:37:24

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2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析
2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析
2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析
2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析
2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析
2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析
2018数学一解析_26.考研数学(一)(二)(三)真题_26.1考研数学(一)真题_02.1987-2025年数一真题答案解析

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2018年数学(一)真题解析 一、选择题 (1)【答案】(D). 【解】 方法一 对/'(工)=cos / H | , 心)_ /(0) =讪 cos/T 订- 1 = _£恤 Ll!不存在,即 /(^)=cos^TT 在z =0 X X Z x 0 Lo lo 处不可导,应选(D). 方法二 当/(jc) = |工| sin | |时,f(jr)-/(0)〜工2,/(工)在工=0处可导且导数为0,不选(A); 3 ~2 当/(X)= |工I sin/工I时,/(^) -/(0)〜I I ',/'(工)在工=0处可导且导数为0,不 选(E); 当/(x)-cos| JC I时〜一*攵2,于(工)在工=0处可导且导数为0,不选(C), 应选(D). ⑵【答案】(E). 【解】 设切点为(工0,九,6),则 ( 之0 =无2 0 十I 夕0 2 , y (2jc 0 9 2y0 — 1) • (1 — 1 ?0) = 0 9 |(2Ho,2j/o,—1) •(工 0—1, 夕 0,20)=0, [•To =0, 卜0 = 1 , 解之得屮y o = 0,或屮y o = 1, 〔J =0, 〔J = 2, 故所求切平面为z = 0或2x +2》—z = 2.应选(E). (3)【答案】(B). 2n + 3 【解】 (2/? + 1) ! n = 0 =cos 1 + 2sin 1, 应选(B). (4)【答案】(C). (1+工) 2 2工 \ 【解】 1 +川丿 1 +工 2 当—守冬工w守时,i + ycosx > i > [(l+T^TT)^ >〕[1山 >[\ 即 K >M>N.应选(C). e ~~2 J ~~2 J ~~2(5)【答案】(A). 【解】方法一 I1 1 0\ /I 1 /I 0 -1\ 令M = 0 1 】 ,A = 0 ] B = 0 1 1 'o I1 1 / 'o 0 0 0 1 /I 1 一1\ I1 0 -1 C = 0 1 0 ,D = 0 1 0 'o 0 1丿 'o 0 1 显然矩阵A,B,C,D的特征值都是4 =入2 =入 3 = 1 9 -1 0 \ /O -1 0 - 1 ,E - A = 0 0 'o 0 0 ' '0 0 ,-cJ: -1 /0 0 1 0 0 ,E -D = 0 0 0 'o 0 o' 'o 0 0 因为 r(E -M) =r(E -A) =2,所以应选(A). 方法二 z1 —1 °\ z1 1 °\ 1 _ 取p = 0 1 0 ,则P (1 1 0 , J 'o 1' 'o 0 0 I1 1 1 0\ /! 1 °\ I1 ;相似,应选(A). 因为pT 0 1 1 P = 0 1 1 ,所以 (, 1 与0 'o 0 1 1 0 1> '0 0 J '0 0 1 ' (6)【答案】 (A). 【解】 (A ,AB) = A(E,B) 9 显然r(A ,AB) =r[_A(E,B )] W 厂(A ) 9 又 r(A,AB) > r(A), 于是厂(A ,AB) = r (A),应选(A). (7)【答案】(A). 【解】f / (jr ) da- = f / ( jc ) djr = £[ /Udz — 0. 3 , Jo J 1 2 J 0 PCX V0) = I /(j? )djr = I f(j2)dx 一 I / ( jc ) djr = 0. 5 一 0. 3 = 0. 2 ,应选(A). J —OO J —OO J 0 ⑻【答案】(D). 【解】 若/已知,则假设的接受域:\u\ 0时,/z(jr ) = jt eJ > 0,函数/(x )在[0, + °°)上单调增加, 所以a =0是方程ae° = eu — 1在[0, +*)上的唯一解,故”l 一 i►m8 g =0. (20)【解】(I ) / (Jf 1 ,jC 2 ,JC 3)=(X ! — JC 2 + 3 )2 + (攵2 +鼻3)' + (工 1 aX =0 的充分必 卜1 一工2 +攵3 =0, 要条件是(攵2 +工3 =0, 对齐次线性方程组的系数矩阵作初等行变换得 [x 1 + ax 3 = 0. Z1 -1 (1 -1 1 \,/I -1 1 \ P ° A = 0 1 1 -» 0 1 I 1 1, J 'o 4 0 、0 1 a -1' 0 a — 2 a 2 日寸 9 f (工]9乂 2 9*2?3)==0只有零解X =(JC ! ,JC 2 ,攵3厂==(0,0,0)T, 1 0 2 <2=2 时,1 1 I , 'o 0 Q)' f(JT ! ,乂2,乂3)= 0 有非零解 x =(JC !,工2,攵 3)T =k(— 2 , — 1,1)T,其中 k # 0. 卩/I -1 1\ /^1\ (Il)aH2 时,令 3^2 = 0 1 1 br2 , J 1 0 a '工 31 -1 1 1 -1 1 Z1 -1 0 1 1 = 0 1 1 =a —2工0,则矩阵0 1 1可逆, 1 0 a 0 0 a 一 2 4 0 a 所以f{xx ,X2 ,JC3) 的规范形为/(歹1,»2,夕 3)= 式+工+工. Q = 2 时 9 f(X !,工 29 乂 3)=(壬1 —工2 +乂 3尸 + (无 2 +工3)' +(力1 + <2 JC 3)? =2jc 1 + 2x 2 + 6jc 3 — 2工 1 工 2 + 6n 3 3 =2(工]一无:+工彳)? + —JC \ + —x \ + 3jC2^3 3 =2(工1 — x2 + 工3)2 +》(工2 + 3)2 所以/(, 口 2 宀)的规范形为f(yi ^y2 ^3)=y\ + yl- (21)【解】(I )显然厂(A) =2,因为初等变换不改变矩阵的秩,所以厂(〃)=2, 而门:; 2 \ /I a 2\ /I a 1 -* o 1 I —。1 r 'o a +13, '0 0 1 1 2 _ a I1 2 2 \ / 1 2 2\ (n)a = 1 3 0 .B = 0 1 '2 -2/ 1' 7 1 1 令 P = (X| ,x2,x3), I1 2 2 1 2 2\ I1 0 6 3 4 4 \ 1 k 由(A *)=1 3 0 0 1 » 0 1 -2 -1 -1 _ 1得 I。 7 -2 -1 1 0 0 0 0 0 ' —6k 2 + 4 2& — 1 2 I — 6^! + 3 -6k2 +4 一6怂+4\ 则所求的可逆矩阵为P= 2R—1 2紅一1 2孔一1 (紅,紇,孔为任意常数且 k2 k3 k2 H 怂). (22)【解】(I )因为E(X) =O,E(X2) =1,E(Y)=入,以及X ,Y相互独立,故 Cov(X,Z)= Cov(X,XY)= E(X?Y)—E(X)E(XY)= E(X2 )E(Y)-E2 (X)E(Y) = A. (H )由Y服从参数为入的泊松分布"即P (V =j ) = e A (j =0,1,2 , •••),于是,Z的所 J ! 有可能取值为全体整数.故Z的概率分布为 1)当怡为正整数时,有 P(Z=b)=P(XY = b)=P(X=l,Y=b)=P(X=l)P(y=b)1 z k =—• (k =1,2,3,…), z k ! 2)当怡为负整数时,有 P(Z =k) =P(XY = b) = P(X = —1,Y = T) =P(X = — l)P(Y = T) 1 } ~k = C •/ 7、■ e (k = 1 9 2 , 3,・・・)9 6 (— k ) ! 3)当怡为0时,有 P(Z =0) =P(XY = 0) =P(X = —l,Y = 0) +P(X =l)P(Y = 0) =P(X = —l,Y = 0) 1 -A I 1 -A _ -A =7e +7e [i P f k = 1,2 9 3 9 … 7TFe 5 故 p(z=e)=丿「, b = 0 9 i 厂 f k = — 1, — 2,一 3,… 〔2 (―厂! (23)【解】(I)似然函数为 丄「牘Z n L (工1 9工2,…9工 “)=11心 (J) —oo < J? i <+ °o,z = 1,2,••• i = 1 2”c" 于是 In L = 一 n In 2 — 7? In cr 一 -Sl-.-l ° 1 = 1 人 din L 1 令 I 2 丨広i I = 0 '得C的最大似然估计量为c =—I Xi | . n = d(7 c C 2=1 " (H)EG)=丄£e(|x, |)=e( M +oo I 工 I y 1 -e 丨工 ° 丨 djr = — x e — — ° cLr n z = i —8 厶O 0 CT f+°° + °+°° _王 =— jc de a =一 x e a e a =o. J o 0 o dG) =1£d( |x, |) D(|X|) _E[|X|2-E2(|X|)] 兀 1 n n i = 京 1 _ 1j_L dj -^ ) 4 ( r X— 丁 2 e _7 x ai x 一 a2 n a T»+<00 x2 de ° —(72 n \J o< T 2jc e ° djr -一 CT2 )=—(2(72 一 CT2 )=— n 'J < / n n
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  1. CONNECT:[ UseTime:0.000548s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000697s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000291s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000517s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000654s ]
  8. SELECT * FROM `wendang` WHERE `id` = 325019 LIMIT 1 [ RunTime:0.000488s ]
  9. UPDATE `wendang` SET `liulancishu` = 8 WHERE `id` = 325019 [ RunTime:0.007560s ]
  10. UPDATE `wendang` SET `lasttime` = 1772490262 WHERE `id` = 325019 [ RunTime:0.000674s ]
  11. SELECT * FROM `wendang` WHERE `id` < 325019 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000765s ]
  12. SELECT * FROM `wendang` WHERE `id` > 325019 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000514s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 325019 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001105s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 325019 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001060s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 325019 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005103s ]
0.091072s