1x1+a1x2+1n13 1a21x1+a2xC2+ 2313 x1+ 31~1 322 +la 313 h1a12 13 若记 D,=6, a 22 23 3233 b1 11a 12 13 或 b2|D=21a2a 23 2
+ + = + + = + + = ; , , 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b , 3 32 33 2 22 23 1 12 13 1 b a a b a a b a a 若记 D = 31 32 33 21 22 23 11 12 13 a a a a a a a a a 或 D = 1 2 1 b b b
a1x1+ 2 + 133 1a21x1+a2xC2+ 2313 a31x1+a34x2+ 313 h1a12 13 记 D,=6, a 22 23 32 133 12 13 即 D,=b2 22 231 32 33
+ + = + + = + + = ;,, 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b, 3 32 33 2 22 23 1 12 13 1 b a a b a a b a a 记 D = , 3 32 33 2 22 23 1 12 13 1 b a a b a a b a a 即 D =
a1x1+a12x2+a13x3=1 a21x1+a2x2+a23x3=b2 a3r-+a322+333=b35 12/a, 13 D=a21 22/a 23 31g32a33
+ + = + + = + + = ; , , 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b 31 32 33 21 22 23 11 12 13 a a a a a a a a a D =
1x1+a12x2+a13x3=b 21x1+a2x2+a23x3=b2 aix, tax,+ax,=b a11 b, 13 得 21 235 131 33 a1x1+a12x2+a13x3 1 a21x1+a2x2+a23x3=b2D= 21 22 311+a32x2+a 33~3 31 32
+ + = + + = + + = ; , , 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b , 31 3 33 21 2 23 11 1 13 2 a b a a b a a b a 得 D = + + = + + = + + = ; , , 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b 31 32 33 21 22 23 11 12 13 a a a a a a a a a D =
1x1+a12x2+a13x3=b 21x1+a2x2+a23x3=b2 aix, tax,+ax,=b a11 b, 13 得 21 235 131 33 a1x1+a12x2+a13x3 a12b1 a211a222+023-31b21=D3=a21 a2 b2 311+a32x2+a 33~3 31 32
+ + = + + = + + = ; , , 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b , 31 3 33 21 2 23 11 1 13 2 a b a a b a a b a 得 D = + + = + + = + + = ; , , 3 1 1 3 2 2 3 3 3 3 2 1 1 2 2 2 2 3 3 2 1 1 1 1 2 2 1 3 3 1 a x a x a x b a x a x a x b a x a x a x b . 31 32 3 21 22 2 11 12 1 3 a a b a a b a a b D =