当前位置:首页>文档>2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解

2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解

  • 2026-03-01 12:43:34 2026-02-23 17:40:03

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2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解
2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解
2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解
2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解
2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解
2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解
2019年数学三真题答案解析_26.考研数学(一)(二)(三)真题_26.3考研数学(三)真题_考研数学(三)真题_02.1987-2025年数三真题详解

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数学(三)参考答案 一、选择题 Cl) C +-X -+ 解 tanx的麦克劳林展开式为X o (x3 ) , 3 故x— tanx�--x3,则 k =3. 故应选C. 3 CZ) D 解 设f(x)=工5— 5x+k,则 厂(x)=5兀 4— 5'令f 1 Cx)= O,得 x=土1. 1 1 当X<-l时,f (x)> O; 当-l l时,f (x)> 0. 又limf(x)=+=, limf(x)=--=,结 合单调性知,f(-l)>O,f(l)O,J(l) =l-5+k ( -1与矿有关,与 µ 无关 我6 迈6 迈6 故应选A 二、填空题 (9) e-1 1 1 1 1 1 n … 解 原式=lim(1 + + + n-= 勹丁了 厂言寸 =! 式气飞叶+(了忙] (士) =e “l 一 im = n =e- 1 . 故应填e-1. (IO) (六:,-2) + 解 y'= .s1nx x cosx -2.si n冗 =x cosx -s1nx , — y = cosx- X s1nx - COSX = x s1nx. 令y"=O,得x1=O,x2 =穴,再判断X 1,X 2 两点的左右两侧二阶导数是否异号; 在X 1 左侧y"o,所以拐点为(六' 2). 2 故应填(六'-2). 1 (11)—(1-2,/2) 18 Ia 解 由分部积分法:『 x 2 f(x)dx= - 3 1 fJ I Cx)dx 3 =了 1 x汀ex)Io 1 — 了 1 I x 3 J'(x) dx , CD 又八1) =『五了尸dt=O,J'(x) =./i丁了,代入CD 式: l 扣 习 a 4 (1)- x 汇了-dx=-_!__·上『五言了dx 3 0 3 4 0 1 2 4 2 3 1 1 = · Cl+x ) 1 (1-2迈). 飞 3 。飞1 故应填一(1-2迈). 18 (12) 0. 4 = = — — 2 = 解 当PB 20时,QA 500 Pi 20P A + 2• 20 1300 -20P A -Pi, 则f/AA = -— PA — dQ — A =- 刁�-" � 凡 -� �• . ( — 20 — 2P A) = _ _ 2 _ P _ A(P _ _ A _ + 10) - ?' QA dPA = 所以f/AA I 0.4. 故应填0.4. PA =10 (13) 1 。 。 。 解 由题意得 :.-(: — 1 汇 (� —。1 �)-(� —。1 0 1 \ . 。 1 — 1 1 1。 - .. . . 1 a 2 -1 a 0 1 a 2 -1 a 0 a 2 -1 a 1I .. = = 要使Ax b有无穷多解,则应使r(A) r(A) < 3, z— — = = 当a l =a 1 O, 即a l时,r(A) =r(A) =2 < 3. 故应填1. 1 2 (4、 _ 丿 3 X =仁-, O EX -1} = P{F i_ — 1} = P 卢> -1 3 4 3 } 纠寸王 = P{X> dx=� . 屈 左2 3 2 故应填—. 3 三解、 答题 (15)解 当X>O时,J'(x) = 2x气lnx+ 1); 当X0 , 综上 J'(x) = { x + e (x 1), X <0 . =— 1 令J'(x) =0,得 驻点x l,x=一. e — 一1 当x< l或O j'(x)> 0. e (o — 所以f(x)在区间( 邑-1)和 且-)内单调减少, e ) — 在区间( 1,0)和(上,十~ 内单调增加,从而f(x)的极小值为 e , !( ) — ——1 —1 二 f( 1)= 1 =e''极大值为f(O)= 1. e e (16)解 因为 a—g — — =y-J.(x+y,x y) f,(x+y,x-y), ax — ag — =x J.( x+ y ,x- y)+ J ,( x+ y ,x -y), ay 臼=— 仁(x+ y,x -y) — 2儿(x+ y,x — y)-几(x+ y,x — y)' 2 a g — a 戎 y=1 J• • (x+y,x-y)十几(x+y,x- y), 2 a g — — 2 J• • (x +y,x y)+ 2儿(x+y ,x -y) 儿(x+ y, x -y), ay 所以 — a 2 g + a 2 g +-a 2 —g — — — 2 2 =1 3f• • (x+y,x-y) 儿(x+ y,x y). ax a戎Y ay (17)解 C I)由一阶线性微分方程的通解公式,得 心 l � -f x � y(x)= i (C+ f e e 扛心)=e (石+C). 2石 因为y(l)=心,所以C=O. rx 已 从而y(x)= 矿. (II)D绕x轴旋转所f 得旋转体的体积为 2 x2 xz 2 4 — V= frc: y (x)心= rcxe dx= 王e 1 1 =王(e e). 2 2 解 (18) 由题意,所求面积为 s += -x I I = (叶1). = I e SlllX dx= �(�1) "f亡sinx心, n-0 吓I - ](n+l)穴 x (n+l)穴 O, 所以——-< - O,P{Z� —l} > o, 所以 P{X 冬 l,Z 冬-1} # P{X�l}P{Z�-1}. 故X与Z 不相互独立. (23) 解 C I)由厂f(x矿)dx =I, 得 -w 厂汇了心 l= =AJ: 卜 e-�dt µ CJ =A• 三『上 e.. ; dt =三A, 2�= If; 2 所以A=�. (I[)设Xi,Xz'…,:r" 为样本X1,X 2 ,…,义的观测值,则似然函数为 -�n (x ' -µ)2 L(矿)= IT ,i f(x,;矿 )=』卢 六 )券(矿) 2 n e ;-1 202 , X1 ,Xz'…, x,, 多µ, ,�I lo' 其他, 对数似然函数为 nl L(矿)= 了 n In ; 2 — 了 n nl r, 2 — 2矿 1 � n (x,-µ)2. d lnL(r, 2) =--n + ] n z . �(x, -µ)气 dr, 2 加 2矿 ,�I 令 d nl d L a ( 2 矿) o, 得6 2 的最大似然估计值为 (J A 2 =— n 1 � n (x, —µ)气 i�I 1 n 所以矿的最大似然估计最为矿=—�(X, —µ)飞 n ,�1
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  1. CONNECT:[ UseTime:0.000450s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000620s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000267s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000514s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000563s ]
  8. SELECT * FROM `wendang` WHERE `id` = 325024 LIMIT 1 [ RunTime:0.000428s ]
  9. UPDATE `wendang` SET `liulancishu` = 6 WHERE `id` = 325024 [ RunTime:0.008354s ]
  10. UPDATE `wendang` SET `lasttime` = 1772454702 WHERE `id` = 325024 [ RunTime:0.005780s ]
  11. SELECT * FROM `wendang` WHERE `id` < 325024 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000644s ]
  12. SELECT * FROM `wendang` WHERE `id` > 325024 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000367s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 325024 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001821s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 325024 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001665s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 325024 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000843s ]
0.091992s