问题 选择题

因式分ax2-4ay2,正确结果是(  )

A.4a(x2-y2

B.a(x2-4y2

C.a(x+2y)(x-2y)

D.4a(x+y)(x-y)

答案

ax2-4ay2=a(x2-4y2),

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

故选C.

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