写出A,E=1 0 0 1 0 02 2 0 0 1 03 4 5 0 0 1 r2/2,r2-r1,r3-3r1~1 0 0 1 0 00 2 0 -2 1 00 4 5 -3 0 1 r3-2r2,r2/2,r3/5~1 0 0 1 0 00 1 0 -1 1/2 00 0 1 1/5 -2/5 1/5这样就得到E,B型所以其逆矩阵为1 0 0-1 1/2 01/5 -2/5 1/5
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