用初等行变换求下列矩阵的逆矩阵的详细步骤

1 2 2 1 0 02 1 -2 0 1 02 -2 1 0 0 1r2-2r1, r3-2r11 2 2 1 0 00 -3 -6 -2 1 00 -6 -3 -2 0 1r3-2r21 2 2 1 0 00 -3 -6 -2 1 00 0 9 2 -2 1r3*(1/9)1 2 2 1 0 00 -3 -6 -2 1 00 0 1 2/9 -2/9 1/9r1-2r3, r2+6r31 2 0 5/9 4/9 -2/90 -3 0 -6/9 -3/9 6/90 0 1 2/9 -2/9 1/9r2*(-1/3), r1-2r21 0 0 1/9 2/9 2/90 1 0 2/9 1/9 -2/90 0 1 2/9 -2/9 1/9满意请采纳 ^_^