[(x+y)的平方-4xy]*[(x-y)的平方+4xy]

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[(x+y)的平方-4xy]*[(x-y)的平方+4xy]

[(x+y)的平方-4xy]*[(x-y)的平方+4xy]
[(x+y)的平方-4xy]*[(x-y)的平方+4xy]

[(x+y)的平方-4xy]*[(x-y)的平方+4xy]
[(x+y)的平方-4xy]*[(x-y)的平方+4xy]
=(x-y)^2*(x+y)^2
=(x^2-y^2)^2
=x^4-2x^2y^2+y^4

((x+y)^2-4xy)*((x-y)^2+4xy)
=(x-y)^2*(x+y)^2
=(x^2-y^2)^2
=x^4-2*x^2*y^2+y^4

[(x+y)²-4xy][(x-y)²+4xy]
=(x²+y²+2xy-4xy)(x²+y²-2xy+4xy)
=(x²+y²-2xy)(x²+y²+2xy)
=(x-y)²(x+y)²
=[(x-y)(x+y)]²
=(x&s...

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[(x+y)²-4xy][(x-y)²+4xy]
=(x²+y²+2xy-4xy)(x²+y²-2xy+4xy)
=(x²+y²-2xy)(x²+y²+2xy)
=(x-y)²(x+y)²
=[(x-y)(x+y)]²
=(x²-y²)²
=x^4-2x²y²+y^4

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