分解因式:4x^2-1/4 y^2=________,ax^2-ay^2=_________,x^2y-9y=_________.
问题描述:
分解因式:4x^2-1/4 y^2=________,ax^2-ay^2=_________,x^2y-9y=_________.
答
(1)4x²-1/4y²
=(2x+y/2)(2x-y/2)
(2)ax²-ay²
=a(x²-y²)
=a(x+y)(x-y)
(3)x²y-9y
=y(x²-9)
=y(x+3)(x-3)