
把下列各式分解因式: (1)2a^2b-4a^2b^3+2ab (2)(x+y)^2-4 (3)3ax^2-6axy+3ay^2
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(1)2a^2b-4a^2b^3+2ab
=2ab(a-2ab^2+1)
(2)(x+y)^2-4
=(x+y+2)(x+y-2)
(3)3ax^2-6axy+3ay^2
=3a(x^2-2xy+y^2)
=3a(x-y)^2
=2ab(a-2ab^2+1)
(2)(x+y)^2-4
=(x+y+2)(x+y-2)
(3)3ax^2-6axy+3ay^2
=3a(x^2-2xy+y^2)
=3a(x-y)^2
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