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3a²-18a+27
9a²-81        

(3 a^2-18 a+27)/(9 a^2-81)(3 a^2-18 a+27)/9 (a^2-9)(3 a^2-18 a+27)/(9 (a^2-3^2))(3 a^2-18 a+27)/(9 (a-3) (a+3))3 (a^2-6 a+9)/(9 (a-3) (a+3))(3 (a-3) (a-3))/(9 (a-3) (a+3))(3 (a-3)^2)/(9 (a-3) (a+3))(a-3)^2/(3 (a-3) (a+3))(a-3)^2-1/(3 (a+3))(a-3)/(3 (a+3))Вот и все.