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2017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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2017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
2017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
2017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
2017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
2017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
2017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
2017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
2017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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2017年数学(一)真题解析 一、选择题 (1) 【答案】(A). 【解】/(0 + 0) = lim ----- =占,/(0) = /(0 — 0) = b , ax 厶 a 因为于(工)在工=0处连续,所以八0 + 0) =/(0) =/(0-0), 从而ab = £,应选(A). (2) 【答案】(C). 【解】 方法一 若fCx)〉0,则fJ)〉0,从而/(I) >/(-1) > 0; 若 f (jt) < 0,则 /(□;)< 0,从而 /(1) < /(- 1) < 0, 故 |/(1)|> |/(-1)|,应选(C). 方法二 由于(工)•于'(工)=y/2(^) '> 0得/'钦工)单调递增, 从而 f2(l) >/2(-1),故 |于(1) |> |/(-1) |,应选(C). (3) 【答案】(D). T 2 3f 【解】 —=2xy, — =^r , 牙-=2z, dx dy dz £Z| =4, iZI =i, £ZI =o, dx 丨 (1,2,0) 3y I (1,2,0) dz I (1,2,0) 1 c 2 2 cos a = — ? cos /? = — 9 cos y = — ? 所求的方向导数为学| =4x£十ixf=2,应选(D). dn I(1,2,0) 3 3 (4) 【答案】(C). 【解】 从£=0到t=t0的时间段上,甲、乙走过的距离分别为 S] = Ui(t)dt9 S2 = 5(£)山9 J o J o 在 t =tQ 时 9S]=S2 + 1C>9 即]Vi (t)dt = I s(t)ck + 10, J 0 Jo 或 f ° i(?)=10,故 t0 = 25,应选(C). J 0 (5) 【答案】(A). 【解】 方法一 令A =aa 1 , A2 =A , 令 AX =AX,由(A? -A)X = (A2 -A )X = 0 得 A2 -A =0,A = 0 或 A =1, 因为trA = a*a =1 +•••+A„得A的特征值为入]=•••=入”=0,入”=1, E — aa 1 的特征值为 A ] = =入”_i = 1,A „ = 0,从而 | E — aa ' | = 0, 即E-aaT不可逆,应选(A).方法二 令 A = E— 0 -1得r(2E -A) =1,则A可相似对角化,从而A〜C; 'o 1 1 0 0 _ 1 °\ 由 2E-B = 0 0 0得r(2E-B)=2,则B不可相似对角化,从而B与A ,C不相似, 0 0 应选(E). 方法点评:设为n阶矩阵,且丨AE — A |=l AE -B | ,即的特征值相同,则 (1) 若矩阵A ,B都可相似对角化,则A〜B; (2) 若矩阵中一个可相似对角化,一个不可相似对角化,则A与於不相似. (7)【答案】(A). P(AB) PCA) - P(AB) 【解】 由 P(A |B) > P(A |B)得 ,即 P(B) P(B) 1 -P(B) F(A |B) > P(A |B)等价于 P(AB) > P(A)F(B); P(AB) F(B) - P(AB) 由 P(B |A) > P(B |A)得 ,即 P(A) 1 - P(A) P(B |A) > F(B |A)等价于 P(AB) > P(A)P(B),应选(A). (8)【答案】(E). 【解】若总体X〜NO,/),则 汀〜xy — 乂屮〜"(“ —i), 因为总体X〜N(〃,l),所以工(X, — “)2〜*2 (兀), 工(X, _ 乂严〜*2(" _ i=1 £=1 再由乂〜N & ,丄)得寻上=庙(乂一〃)〜N(0,l),从而n(X-M)z〜/ (I), 4n 不正确的是(B),应选(E). 二、填空题 (9)【答案】0. 【解】 方法一 f O = ~ —\—XZ + z" — J7 ° + 工* + O (工 * ),f ⑶(0) 由/严=0得/⑶(0)=0. 方法二 根据求导改变奇偶性的性质,因为_/(工)为偶函数,所以/■⑶(工)为奇函数, 故 /■⑶(0)=0. (10) L答案】e~' (C! cos麗工 + C2sin42x ) (C] ,C2 为任意常数). 【解】 特征方程为入2 +2入+3=0,特征值为心,2 = — 1 土施i, 通解为夕=e r (C! cos扼工+ C2) (C! ,C2为任意常数). (ID [答案】一1. a》 【解】—,Q = X + y x 2 +I _ y2 —— 7 1 9 0 P 2xy DQ 2axy (jr2 + y2 _ 1 )2 3x (j:2 +y2 — l)z °P ,故 a =_1. 因为曲线积分与路径无关,所以3- ox dy I (12)【答案】 (1 十 HF [解] 方法一 SCz)=工(一l)"Tm”T= _ [工(一1)"工"]'=_(占三 ] (1+77' n = l n = l 丄十力 方法二 令 SQ) =〉](— 1)"T”h"T , n = l « oo « 则 S (jc )djr = 丫 (— 1)"T nx z,_1 dj?=工(—l)"T«z Jo W = 1 J 0 n = l —X _ X 1 + h 1 + Jtr 1 1 故 s(x) = \T+^ (i+^)2' (13)【答案】2. 【解】(Aai ,Aa2 ,AaQ =A ,a?’a:】), 因为 a ! ,a2,a ,线性无关,所以(a i ,a2,a3)可逆,从而 r(Aa i ,Aa2 ,Aa3) = r(A), 由」: 1 |得r(A ) =2,故向量组Aa ! ,Aa2 ,Aa 3的秩为2. 'o 0 o' (14)【答案】2. — 4- 【解】X的密度为y(_z)=0. 5卩Q)+0. 25讥/ j一r y— °+°° r+°° f+°° (工 —4 \ E(X)= 亠订(工)山=0.5匸列&血+0.25匸吗(飞一) + 2)卩(无)(1工=2 (p(j:)dx = 2.方法点评:本题考查连续型随机变量的分布函数、密度函数及数字特征,需要注意以下几点: (1)若随机变量的分布函数为FQ),则其密度函数为 (F'(h), x为F(h)的可导点, /•(X)= (0, 鼻为FQ)的不可导点. f+w (2)若/(^)为随机变量的密度函数,则 /(x)d^ =1. J —oo P4-OO (3)标准正态分布的密度函数爭(工)为奇函数,即|攵*卩(工)山 =0(怡为正奇数). 三、解答题 字=eJ/i — sin x • f;, (15)【解】 dx I x 0 d纽= W + e" (e 丁〔1 一 sin x • f\2 ) — cos x • f\ — sin x d — sin x • f\2)? djr2 则彤 x =0 (16)【解】lim £ 与ln(l + —) = lim 丄工—ln(l + —~) = [ ln( 1 + jr )djr = ] rt ' ri f “fg n k = x n \ n > Jo 1 f1, , 、★ 2、 1 21 zn , J1 1 f1 E —1)+ 1」 =— ln(l + ^r)d(jc) = —x ln( 1 x}------ -------.----------dr Z J o 2 Io z J o 1+z 1 , n 1 f1 / . , 1 \ , 1 ’ c 1 , 1 1 …1 2 2 Jo \ \+x> 2 4 2 2 4 方法点评:本题考查定积分的定义求极限. n项和求极限一般分为两种类型: (1) 分子次数齐、分母次数齐,且分母的次数高于分子一次,采用定积分定义求极限,即 lim —)djr . ”―8 n J ' Jo (2) 若分子次数或分母次数不齐,一般使用迫敛定理. (17) [解】jc3 + j/3 — 3_r+ 3y — 2= 0 两边对工求导得 3于+ 3y2 y/ — 3 + 3,yz = 0, 令3/'=0得= •— 1 ,j?2 =1,对应的函数值为夕1 = 0,夕2 =1; 3jt2 + — 3 + 3y' = 0 两边再对工求导得 6工 + 6yy,2 + Zy2y" + Zy" = 0, 由夕"(一 1)=2> 0得= — 1为极小值点,极小值为y = 0 ; 由y”( 1)=一 1V0得x =1为极大值点,极大值为y =1. (18) 【证明】(I )根据极限保号性,因为lim力⑴ V0,所以存在&〉0, lo+ £ f (工) 当工e(o,&)时,—— v o,即当工e(o,&)时/(jr) + 2a 2 — a 3 = 0 9 由 得AX=P的通解为 + a 2 + a 3 1 X = ^ | 2 | + 11 j (k为任意常数). 1 / 2 1 I (21)【解】 A = -1 | , X = 久2 /、(219工29工3)=乂' AX 9 a 1 4 1 工3 因为入3=0,所以|A 1 = 0. 2 1 -4 由 IA | = 1 -1 1 =—3(a — 2) = 0,得 a = 2. -4 1 a A — 2 — 1 4 由 |AE-A| = -1 A +1 —1 A (A +3)(入-6)= 0,得入 i 一3,入 = 69入 0・ 2 3 = 4 — 1 A — 2/ 5 1 _ 4\ /I 0 _ 1 \ 由一3E - A 1 2 1 -* 0 1 1 得 4 1 5 / 'o 0 0 ' / 4 - 1 4 \ /I 0 1\ 由 6E-A = - 1 7 - 1 0 1 0 得 ' 4 — 1 4 / 0 0, 心=6对应的线性无关的特征向量为a2 = [I 0 — 由。… 1 —2得入3=0对应的线性无关的特征向量为03 'o 0 0 ' 1 1 故正交矩阵为 1 t X = QY , 。 /(! ,X 2 ,久 3)= X AX ===== 一 3 》 1 + 6y 2 . fi 2 (22)【解】(I )E(Y)= 夕• 2yd_y =—, 3 2 P{Y£E(Y)} ■卜]冷夕 (n )方法一 Fz(z) =P{Z ^z} =P{X -\-Y ^z}, 当 z <0 时,Fz(z) = 0; 当 z > 3 时,Fz(z) =1; 当 o < z < i 时,Fz(z)=F{x=o,y0- (U )E(Z) =E(|X, — 〃 | )=E(|X】一〃 | ) *4-00 2c L -y 2 . 2(7 »+oo t2 2(7 2(7 top Ct )dt =------ te dt e_Yd o a/27T ' 0 ■x/2tT由=丄£乙=z,得a的矩估计量为i Z. 72? n 7 2 (in)似然函数为 L=f5)...f〈zQ=: (彳+•••+£) e 2ff (Nz〉0d=l,2,・・・M), 6 In L =72 In 2 一 z? In cf 一 n In a/2tt-------+ ••• + n: ) 9 2(j 由 ^lnL=_7 + 占 3 + “+»=o 得& 故。的最大似然估计量为6
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  1. CONNECT:[ UseTime:0.000662s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000879s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001561s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000781s ]
  6. SELECT * FROM `set` [ RunTime:0.001917s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000787s ]
  8. SELECT * FROM `wendang` WHERE `id` = 325011 LIMIT 1 [ RunTime:0.008656s ]
  9. UPDATE `wendang` SET `liulancishu` = 6 WHERE `id` = 325011 [ RunTime:0.006328s ]
  10. UPDATE `wendang` SET `lasttime` = 1772540404 WHERE `id` = 325011 [ RunTime:0.001608s ]
  11. SELECT * FROM `wendang` WHERE `id` < 325011 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004434s ]
  12. SELECT * FROM `wendang` WHERE `id` > 325011 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000702s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 325011 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013488s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 325011 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012077s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 325011 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.029966s ]
0.166912s