这一题，解答过了。第（3）题|A|=a1a2...anA*=a2...an 0 0 ... 00 a1a3...an 0 ... 00 0 a1a2a4...an ... 0...0 0 0 ... a1a2...an-1则A^-1=A*/|A|=1/a1 0 0 ... 00 1/a2 0 ... 00 0 1/a3 ... 0...0 0 0 ... 1/an
