你好!
是积为 1/3 吧
3^a × 9^b ×27^c = 1/3
3^a × 3^(2b) × 3^(3c) = 1/3
3^(a+2b+3c) = 3^(-1)
a+2b+3c = -1
(a+2b+3c)^2012 = 1