解: D =r1+ar2 0 1+aba0-1b10 0 -1c1 00 -1dr1+(1+ab)r3 00 a+c+abc 1+ab-1b10 0 -1c1 00 -1dr1+(c+abc)r4 0001+ab+d(a+c+abc)-1b10 0 -1...