因式分解:x²y-4y

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因式分解:x²y-4y

因式分解:x²y-4y
因式分解:x²y-4y

因式分解:x²y-4y
x²y-4y
=y(x²-4)
=y(x+2)(x-2)

x²y-4y
=y(x^2-4)
=y(x+2)(x-2)

答:
x²y-4y
=(x²-4)y
=(x-2)(x+2)y