由此即得x=233 45 5=2X5-3(x3,x1可任意取值) 令x3=c1,x4=C2,把它写成通常的参巍形式 =2c, (5) 29 =-2c 2 3 +c 3 3 =C1 0 0 =C 上页         = = = - - = + , , , 3 4 2 , 3 5 2 4 2 3 1 2 2 2 1 2 2 x c x c x c c x c c ( , ). x3 x4 可任意取值 由此即得      = - - = + , 3 4 2 , 3 5 2 2 3 4 1 3 4 x x x x x x 令 x3 = c1 , x4 = c2，把它写成通常的参数形式 . 1 0 3 4 3 5 0 1 2 2 1 2 4 3 2 1                 + -             - =                c c x x x x