求逆矩阵1 -1 1 1 0 0 1 0 0 1 2 1-2 -1 -2 0 1 0 =》 0 1 1 -2/3 -1/3 0 4 3 3 0 0 1 0 0 1 -2/3 -7/3 -1结果为 1 2 1 -1 -4-2/3 -1/3 0 * -1 = 1 得x1 = -4 ,x2 = 1 ,x3= 4-2/3 -7/3 -1 -1 4