将矩阵化为阶梯型
(1) A=1 1 2 -12 1 1 -12 2 1 2r3-r2,r2-2r11 1 2 -10 -1 -3 10 1 0 3r3 r21 1 2 -10 -1 -3 10 0 3 2(2) A=1 1 5 -11 1 -2 33 -1 8 11 3 -9 7r2-r1,r3-3r1,r4-r11 1 5 -10 0 -7 40 -4 -7 40 2 -14 8r3-r2,r4-2r21 1 5 -10 0 -7 40 -4 0 00 2 0 0r3 2r41 1 5 -10 0 -7 40 ...全部
(1) A=1 1 2 -12 1 1 -12 2 1 2r3-r2,r2-2r11 1 2 -10 -1 -3 10 1 0 3r3 r21 1 2 -10 -1 -3 10 0 3 2(2) A=1 1 5 -11 1 -2 33 -1 8 11 3 -9 7r2-r1,r3-3r1,r4-r11 1 5 -10 0 -7 40 -4 -7 40 2 -14 8r3-r2,r4-2r21 1 5 -10 0 -7 40 -4 0 00 2 0 0r3 2r41 1 5 -10 0 -7 40 0 0 00 2 0 0交换行1 1 5 -10 2 0 00 0 -7 40 0 0 0(3) A=1 -1 1 -12 -1 0 13 1 2 -14 1 3 2r4-r1-r3,r2-2r1,r3-3r11 -1 1 -10 1 -2 30 4 -1 20 1 0 4r2-r4,r3-4r41 -1 1 -10 0 -2 -10 0 -1 -140 1 0 4r2-2r31 -1 1 -10 0 0 270 0 -1 -140 1 0 4交换行1 -1 1 -10 1 0 40 0 -1 -140 0 0 27。
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