(x-2y)²(x+2y)² )
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(x-2y)²(x+2y)² )
![(x-2y)²(x+2y)² )](/uploads/image/z/15221994-42-4.jpg?t=%EF%BC%88x-2y%EF%BC%89%26sup2%3B%EF%BC%88x%2B2y%EF%BC%89%26sup2%3B+%EF%BC%89)
(x--2y)^2(x+2y)^2
=[(x--2y)(x+2y)]^2
=(x^2--4y^2)^2
=x^4--8x^2y^2+16y^4.
=[(x--2y)(x+2y)]^2
=(x^2--4y^2)^2
=x^4--8x^2y^2+16y^4.
(x+y)²-2(x²-y²)+(y-x)²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
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