(1)2x²y²-8y^4
=2y²(x²-4y²)
=2y²(x+2y)(x-2y)
(2)2x²-4xy+2y²
=2(x²-2xy+y²)
=2(x-y)²
1、1/42x²y²-8y^4=2y²(x²-4y²)=2y²(x+2y)(x-2y)2x²-4xy+2y²=2(x²-2xy+y²)=2(x-y)²
