1x1+a1xx2+1n13 a21x1+a22+{233=b2 311+a322 +33 3 12 13 记 D,=b2 a22 235 3233 12 13 D,=b, a, a 23 32 33 上页
+ + = + + = + + = ;,, 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 =
1 1 a 1X,+a12X 12 2 3~3 a21x+a2x2+a23x3=b2 31x1+a2x2+a3x3=b 11 12 13 D 21 22 23 31 32 33 上页
+ + = + + = + + = ; , , 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 =
a1x1+a12x2+a13x3= 1x1+ r ta 22~2 23~3 a31 1+a32-I2+333=b3 3 得 D 21 b2 235 31 33 a1x1+a12y,+a12x2=D, 1 2 13 a21x1+a2x2+a23x3=b2 D=a a 2223 a31x1+a32x2+a3x3b3 31 32 圆[回 上页
+ + = + + = + + = ; , , 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 =
a1x1+a12x2+a13x3= 1x1+ r ta 22~2 23~3 a31 1+a32-I2+333=b3 3 得 D 21 b2 235 31 33 a1x1+a12y,+a12x2=D, a1a12 b a21x1+a2x2+a23x32→D3=a21a2b2 a31x1+a32x2+a3x3b3 31 32 上页
+ + = + + = + + = ; , , 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 =
2 3 12 13 D=a212a23D1=b2a2m23 31 32 33 32 12 1ba13 D=n21 22 =la 21 2235 31 32 31D3a3 则三元线性方程组的解为: D D x1=,x2=2, D D 3 D 上页
, 31 3 33 21 2 23 11 1 13 2 a b a a b a a b a . D = 31 32 3 21 22 2 11 12 1 3 a a b a a b a a b D = 则三元线性方程组的解为: , 1 1 D D x = , 2 2 D D x = . 3 3 D D x = 31 32 33 21 22 23 11 12 13 a a a a a a a a a D = , 3 32 33 2 22 23 1 12 13 1 b a a b a a b a a D =