f(x) = (1/3)^(x^2-2x)令g(x) = x^2-2x,对称轴x=-2/(-2)=1,开口向上x∈（-∞,1）时,g(x) = x^2-2x单调减,f(x) = (1/3)^g(x)单调增；x∈（1,+∞）时,g(x) = x^2-2x单调增,f(x) = (1/3)^g(x)单调减.故单调增区间（-∞,...