求通解
求方程组X1-X2-X3+X4=0,X1-X2+X3-3X4=1,2X1-2X2-2X4=1的通解
X1 - X2 - X3 + X4 = 0 (1) X2 - X2 + X3 - 3X4 = 1 (2) 2X1 - 2X2 - 2X4 = 1 (3) (1) + (2): 2X1 - 2X2 - 2X4 = 1 X3 = 2X4 + 1/2 (5) (3) ==> X1 = X2 + X4 + 1/2 通解为: X1 = s + t + 1/2 X2 = s X3 = 2t + 1/2 X4 = t s, t 为任意值
X1=X2=任意值,X3=X4=-1/2
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