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(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料

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(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料
(46)-线代2矩阵1笔记版_08.2026考研数学高途王喆全程班_赠送2025课程_25考研数学(三)全年智达班_{2}--资料

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2025第二章 矩阵一、矩阵的运算  a + b a + b a + b  11 11 12 12 1n 1n   a + b a + b a + b 1.加法A + B = (a + b ) =  21 21 22 22 2n 2n  mn mn ij ij mn     a + b a + b a + b   m1 m1 m2 m2 mn mn mn  a a a  ↳ 11 12 1n   a a a  21 22 2n  2.数乘A = (a ) = ij mn     a a a   m1 m2 mn mn SE 0 * *E : XA An #E : XA = 0 = = => X = 0 A = 0二、矩阵的乘法 设A ,B , 则AB = C = (c ) ,其中 ms sn mn ij mn s  c = a b + a b + + a b = a b ,(i = 1,2, ,m; j = 1,2, ,n). ij i1 1 j i2 2 j is sj ik kj k=1 : ① r(Al r(B) = S & B3/7 + BE - AX 07. = EIAE A B # A B & . = 0 = o = 0 YEAAB B = 0 = =0 ③ EEE ABC CAB) C A (BL = . = 三、方阵的幂 Ak = A  A  ... A称为方阵 A的k次幂. k个 (AB)" # A 4. B" (A + Bl = A + 2 AB + B2 12 A AB BA = + + +特殊矩阵——成比例矩阵(秩 1 矩阵) /]x35 EXEXER(4/EBE 1 3 : = . ( =( ⑳b Gibz Gibs - dbb - I , I Grh ⑫ Grbs , asb anb b , ( ) 3) , )(213) # A = = 63 9 A FEB = => (A1 1B1 = 1 . => (A) + 0三、可逆矩阵的性质 1.(A−1)−1 = A; 1 2. A−1 = ; A 1 3.(A)−1 = A−1 ;  4.(AT )−1 = (A−1)T ; B) 5.(AB)−1 = B−1A−1 ; (A = + A + BT = 推广(1) (A A A )−1 = A −1A −1 A −1 ; 1 2 m m m−1 1 (2) (An )−1 = (A−1)n .四、分块对角阵的逆 −1  A    A−1   1 1     A A−1 1.  2  =  2  .          A  A−1     s s −1  A   A −1  1 n     A  2    2. = .    A −1  2     A A −1     n 1思路 1——判断A可逆的方法主要有 1.定义法;2.| A | 0,这是主要方法. 思路 2——求逆矩阵的方法有: 1.定义法:如果有一个 n 阶方阵 B ,使AB = BA = E,则B = A−1 .一般适 用于抽象矩阵. 1 2.伴随法:A−1 = A* ,一般适用二阶或者三阶数值型矩阵; A ( ) 3.初等行变化法: ( A | E ) ⎯ 行 ⎯→ E | A −1 ,一般适用于三阶及 n n n n 以上的数值型矩阵.−1 −1 A O A−1 O  O A  O B−1  4.分块矩阵法: = , = ,其         O B O B−1 B O A−1 O         中A,B均可逆. 思路 3——求逆矩阵的运算要充分利用逆矩阵的性质与“加变乘”思 想来进行计算.【例2.4】 下列命题正确的是( ). (A) 若AB = E,则 A D 可逆,且A−1 = B (B) 若A,B均为n阶可逆矩阵,则A + B必可逆 (C) 若A,B均为n阶不可逆矩阵,则A − B必不可逆 (D) 若A,B均为n阶不可逆矩阵,则AB必不可逆. -A BBB#. R(1 : A (1 1) B = (i) AB = C = E, (A) = . . (2( A ) o B = ) = j)A + B = 7 % % (B) = = 01 (c) (B A 1 % ) B = (89) A - B = (0 -) = = (b) A B / * = (A) =0 (B1 =0 111 (ABI = (A) 1B1 = 0 = AB7 . . ,【例2.5】 设 A为n阶非奇异矩阵,为 n 维列向量, b 为常数.记分块矩  E O   A  阵P = ,Q = ,其中 A 是矩阵 A的伴随矩阵,E 为     − T A A  T b     n 阶单位矩阵. (1) 计算并化简PQ; my) (in))) ( pa = = - - a + # A 1A)E #* 1AI At = = . * A 2 )o A2) I PQ b) : = = # O - + 1 .(2) 证明:矩阵Q可逆的充分必要条件是 T A−1  b. T iR35 7 F [ii] (Q) , , IPQI IQ) = IP/ E 8 LERA (Pl (E) /All (A) : = = · = * GTA IAI - A 2 IPQ1 = (A) 1 kI(b-2TA2) P (b-LTA) = . = . IAI(b-2A+ d) 0 = + (b 2TA 2) (a) = : . - AFF Q7 1Q1 LA b -: : /Alto : + 0 E【例2.6】 设n阶矩阵 A , A2 + A − 4E = 0,证明 A + 2E可逆,并求 ( )−1 A + 2E . A LEDA : : + A - 4E = 0 E) (A zE (A 2E) - 0 = .: + - (A 2E) (A-El 2 E . + =
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  1. CONNECT:[ UseTime:0.000969s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001390s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000722s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000677s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001468s ]
  6. SELECT * FROM `set` [ RunTime:0.000573s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001455s ]
  8. SELECT * FROM `wendang` WHERE `id` = 327441 LIMIT 1 [ RunTime:0.001143s ]
  9. UPDATE `wendang` SET `liulancishu` = 3 WHERE `id` = 327441 [ RunTime:0.003992s ]
  10. UPDATE `wendang` SET `lasttime` = 1772130392 WHERE `id` = 327441 [ RunTime:0.005624s ]
  11. SELECT * FROM `wendang` WHERE `id` < 327441 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000509s ]
  12. SELECT * FROM `wendang` WHERE `id` > 327441 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000562s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 327441 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000475s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 327441 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001968s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 327441 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000913s ]
0.099020s