：(4x^2+y^2)^2-16x^2y^2解原式=(4x²+y²)²-16x²y² =(4x²+y²+4xy)(4x²+y²-44xy) =(2x+y)²(2x-y)²
(4x^2-y^2)^2
(x+y)(x+y)(x-y)(x-y)
（4x^2-y^2)^2
