(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a^2b(x-y)一4ab(y-x)

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(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a^2b(x-y)一4ab(y-x)
(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a
(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a^2b(x-y)一4ab(y-x)

(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a(1) 3y^3一6y^2十3y (2) (x一2)^2一x十2 (3)12a^2b(x-y)一4ab(y-x)

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