例1用克拉默则解方程组 2x1+x2-5x3+ 8 x1-3x2-6x4=9, 2x2-x3+2x4=-5 x1+4x2-7x3+6x4=0 解 51 07513 30 2 30-6 D 02-12n4 02 12 4-76 07-712例1 用克拉默则解方程组 4 7 6 0. 2 2 5, 3 6 9, 2 5 8, 1 2 3 4 2 3 4 1 2 4 1 2 3 4 x x x x x x x x x x x x x x 解 1 4 7 6 0 2 1 2 1 3 0 6 2 1 5 1 D 1 2 r 2r 4 2 r r 0 7 7 12 0 2 1 2 1 3 0 6 0 7 5 13