方程的一般解为:(-1/3,-2/3,0,0,-1)+k1(4/3,5/3,1,0,1)+k2(1/3,-2/3,0,1,0)
求解线性方程组 x1-2x2+3x3-x4-x5=2 x1+x2-x3+x4-2x5=1 2x1-
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