这道题怎么因式分解?
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(1)
2ax^2-2ay^2
=2a(x^2-y^2)
=2a(x-y)(x+y)
(3)
(2x+y)^2 - (x+2y)^2
=(2x+y-x-2y)(2x+y+x+2y)
=(x-y)(3x+3y)
=3(x-y)(x+y)
2ax^2-2ay^2
=2a(x^2-y^2)
=2a(x-y)(x+y)
(3)
(2x+y)^2 - (x+2y)^2
=(2x+y-x-2y)(2x+y+x+2y)
=(x-y)(3x+3y)
=3(x-y)(x+y)
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