A 369 3-2 3 2 =3A 3 所以，A=2A=3AA=3A=3x3A=32A 故A”=3”-1A. 1 1 1 1 2 3 2 3 2 2 2 3 3 3 3 2 2 3 2 9 2 1 1 2 1 2 1 3 1 3 1 3 1 6 3 2 3 9 3 A A         =             = =       所以， 3 2 2 2 A A A AA A A A = = = =  = 3 3 3 3 3 故 1 3 . n n A A− =