07线性代数讲义[1](18)

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

y².(i)· k §0=cs+1,gñ"Ïd§ §|ÃA"

(ii)dGrammer{u½n1.17 &"(iii)4Cv«·K1.19¥'Ý (II)§¿ ±b#§é?Ûj,kcj,ij=1,ct,ij=0,¨t=j "=Ii1 ¥Øc1,i1=1©§Ù§£ Ñ´"§Ó G§=Iij ¥Øcj,ij=1©§Ù§£ Ñ´"§1≤j≤s.ù §d(II)éA' §|&

xit=ct,n+1

j=i1,···,is

ct,jxj,1≤t≤s,

Ù¥xj,j=i1,···,is,´gd þ(½ö`§xj,j=i1,···,is,´?¿~ê)"§ ´ §|(I)'ÏA"2

~¦ §|'ÏA

2x1 3x2+6x3+2x4 5x5=3

x2 4x3+x4=1.

x4 3x5=2¯´ FG§A.w, §|'yPÝ AÏdgd þ x3,x5.ÏA x1= 2+3x3 5x5

x2= 1+4x3 3x5,

x4=2+3x5Ù¥x3,x5´?¿~ê"

µP72,2"P147(1).2.^ 40{uAe S §| .

2x1+x2 2x3=10 x1+2x2 3x3=6

(1).3x1+2x2+2x3=1(2).2x1 x2+4x3=2 4x1+3x2 2x3=14 5x1+4x2+3x3=4

x1+x2 3x4 x5=0 x x+2x x=0 2x1 3x2+6x3+2x1 5x5=3

1234

(4).(3).x2 4x3+x1=1

4x1 2x2+6x3+3x4 4x5=0 x1 3x5=2

2x1+4x2 2x3+4x4 7x5=0