《线性代数》,唐忠明编著,习题解答第一章线性方程组与消元法P.6习题1、用消元法解下列线性方程组20......(1)xy,,,,1,,,,,xy23......(2),【解】(1)2(2):331......(3),,,,,xx将,3,代入,1,:4)y(..,...2.于是解得:(,)(1,2)#xy,xxx,,,20......(1),123,xxx,,,1......(2),2,,123,353......(3)xxx,,,123,【解】(1)(2):231......(4),,,xx12(1)(3):473......(5),,,xx12(4)(2)(5):1......(6),,,,x2(6)(4):1......(7),,,x1(7)...