问题 解答题

(1)2x2y-8xy+8y               

(2)a2(x-y)-4b2(x-y)

答案

(1)2x2y-8xy+8y,

=2y(x2-4x+4),

=2y(x-2)2

(2)a2(x-y)-4b2(x-y),

=(x-y)(a2-4b2),

=(x-y)(a+2b)(a-2b).

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