大学线性代数讲义前面有对知识的讲解,后面是习题。便于理解。不想挂科的同学们的必备之物

2).¢ , §;

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a11a21a31···an1

a12a22a32···an2

···a1nb1···a2nb2···a3nb3············annbn

ù«ÝG®² û½ §|(VI),Ïd· § AÏ'¶¡µÝ ,P

a11a12···a1n a 21a22···a2n

A= .· ò

············

an1an2···ann

¯= A

a11a21···an1

a12a22···an2

···a1nb1

···a2nb2

······

···annbn

¡ (VI)'yPÝ .Ù¢é(VI)cIÐ1g Ò´éÙyPÝ cIÐ1g ,Ïd· ' £{ ±QÝ ¥cI.~Xþ¡'~f [ ±^Ý 'Gª Ñ@t .

2x1 x2+3x3=1

~.¦A4x1 2x2+5x3=4

2x1 x2+4x3= 1 2 1312 1312 131

A.ÙyPÝ 4 254 → 00 12 → 001 2

2 14 1001 20000

1

2x1 x2+3x3=1x1=(7+x2)

& §|,  & .

x3= 2x3= 2

x2´gd þ.( ù«¹kgd þ'A,¿ §|'?¿AÑUd§v«,ù«A& ¡ ÏA,½ö A.)

2x1+x2 2x3+3x4=1

~.¦A3x1+2x2 x3+2x4=4

3x1+3x2+3x3 3x4=5