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(49)-线代9特征值特征向量2空白版_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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(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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
(49)-线代9特征值特征向量2空白版_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第五章 特征值特征向量 2题型四、判断非对角矩阵 A 和 B 是否相似(★★★) 解题思路——如果 A 和B都不是对角矩阵,则 A 和B相似的判断方法: 第一步、用相似的必要条件验证:先求出 A 和 B 的特征值,如果特征值 不完全相同,则 A 和 B 必定不相似. 第二步、如果 A 和 B 的特征值完全相同,则 1.如果 A 和B都可相似对角化,则 A 和B相似  它们的特征值全相同.且 如果 P 1 − 1 A P 1 = Λ , P 2 − 1 B P 2 = Λ ,则 P − 1 A P = B ,且 P = P 1 P 2 − 1 . 2.如果 A 可对角化,而B不可对角化,则 A 和B一定不相似. 3.如果 A和 B 都不可对角化,则用如下方法判断: A和 B 相似 A E  − 和 B E  − 也相似.【例 5.10】设矩阵 A =  1 0 2 3  ,那么下列矩阵中  1 0 5 3   3 0 , ,   −6 1    1 4 2 3  ,  − 2 1 − 2 1  与 A 相似的矩阵的个数( ). (A) 1 (B) 2 (C)3 (D) 4−2 −2 1  2 1 0      【例 5.11】已知矩阵 A = 2 3 −2 与B = 0 −1 0 . 判断      0 0 −2 0 0 −2     A 和 B 是否相似;如果相似,请求可逆矩阵 P 使得P−1AP = B;如果不相 似,请说明理由.题型五、相似对角化的应用(★★★) 解题思路——如果 A 可相似对角化,则由其特征值与线性无关的特征 向量可求 A 和 A n .由 P − 1 A P = Λ ,可解出 A = P Λ P − 1 ,于是 A n = P Λ n P − 1 .【例 5.12】设 3 阶方阵 A 的特征值 =  = −1, = 0,对应的特征向 1 2 3 量 p 1 = ( − 2 , 1 , 0 ) T , p 2 = ( 1 , 0 , 1 ) T , p 3 = ( 2 , 0 , 1 ) T . (1) 求矩阵 A;T (2) 设向量= (1,1,3) ,求 A 1 0 1 .题型六、实对称矩阵的正交相似对角化(★★★★) 一、正交矩阵 1.正交矩阵 如果n阶实方阵 A 满足 A A T = E , 则称 A 为正交矩阵. 2.正交矩阵的性质 (1) A 为正交矩阵的充要条件是 ①每一行(列)都是单位行(列)向量; ② A 的任意两行(列)都是正交的. (2) A 为正交矩阵,则 | A | =  1 ; 注:相互正交的向量组必线性无关,但反之未必.二、实对称矩阵的特征值与特征向量的性质 性质 1. 实对称矩阵的特征值必全为实数. 性质 2. 实对称矩阵的属于不同特征值的特征向量之间不但线性无关, 而且相互正交. 性质 3.实对称阵必可相似对角化. 性质 4.实对称矩阵不但可相似对角化,而且可正交相似对角化,即必 存在一个正交矩阵 Q ,使得 Q − 1 A Q = Q T A Q = Λ ,称 A 正交相似于对角 矩阵 Λ.三、实对称矩阵正交相似对角化 第一步、求出方阵 A的 n 个特征值, , , ; 1 2 n 第二步、再由方程组(A −E)x = 0求出所对应的线性无关的特征向量 i 1 , 2 , , n    ; 第三步、将 , , , 正交化、单位化: 1 2 n 情形 1 若, , , 互不相同,则仅仅需要把 1 2 n 1 , 2 , , n    单位化为 e 1 , e 2 , , e n ; 情形 2 若 i 为 2 重以上特征值,要检查其特征向量是否正交,若不正 交必须对的特征向量 , , , 用 Schmidt 正交化方法进 i i1 i2 is 行正交化:1 1 , 2 2 [ [ 2 1 , , 1 1 ] ] 1 , ,          = = − [ , ] [ , ]  = − n 1  − − n n−1  . n n 1 n−1 [ , ] [ , ] 1 1 n−1 n−1 然后将所有正交的特征向量单位化成e ,e , ,e ,其中 1 2 n e 1 1 1 , e 2 2 2 , , e n n n       = = = . 第四步、令Q = e ,e , ,e ,   1 2 n Λ 1 n   =   ,于是 Q−1AQ = QT AQ = Λ.解题思路——实对称阵 A 可正常相似对角化,也可正交相似对角化; 如果正交相似对角化,则需要将 A 的 n 个线性无关特征向量正交化(只 需将二重以上特征值的线性无关特征向量正交化)、单位化. 对于实对称阵 A ,有如下结论: 1.如果已知 A 的特征值 1 2 3      ,则知道 1  和 2  可求出 3  . 2.如果已知 A 的特征值 1 2 3    =  ,则知道 1  和 可求出 ;知道 也 2 3 3 可求出 1  和 2  .【例 5.13】设 A 为 4 阶实对称矩阵,且 A 2 + A = O ,若 A 的秩为 3,则 A 相似于 ( ) (A)  1 1 1 0  (B)  1 1 − 1 0  (C)  1 − 1 − 1 0  (D)  − 1 − 1 − 1 0  .【例 5.14】已知 A 是 3 阶实对称矩阵,存在可逆矩阵 P ,使得 P − 1 A P = Λ =  3 − 6 0  ,且已知矩阵 P 的第一列为 p 1 = ( 1 , a , 1 ) T ,第二 列是 p 2 = ( a , a + 1 , 1 ) T ,求正交矩阵 Q 使得 Q T A Q = Λ 及矩阵 A.【例 5.15】设 3 阶实对称矩阵 A 的各行元素之和均为 3,向量 ( )T  = −1,2,−1 , 1 2 ( 0 , 1 , 1 ) T  = − 是线性方程组 A x = 0 的两个解. (1)求 A 的特征值与特征向量;(2)求正交矩阵 Q 和对角矩阵 Λ ,使得 Q T A Q = Λ 为对角阵;(3)求 A 及  A − 3 2 E  6 ,其中E 为三阶单位矩阵.
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  1. CONNECT:[ UseTime:0.000859s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000922s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001021s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000185s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000606s ]
  8. SELECT * FROM `wendang` WHERE `id` = 327447 LIMIT 1 [ RunTime:0.005673s ]
  9. UPDATE `wendang` SET `liulancishu` = 4 WHERE `id` = 327447 [ RunTime:0.012246s ]
  10. UPDATE `wendang` SET `lasttime` = 1772111288 WHERE `id` = 327447 [ RunTime:0.000549s ]
  11. SELECT * FROM `wendang` WHERE `id` < 327447 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000522s ]
  12. SELECT * FROM `wendang` WHERE `id` > 327447 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000976s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 327447 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000504s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 327447 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004599s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 327447 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001018s ]
0.174925s