（x+2y)^2(x^2-2xy+4y^2)^2=
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（x+2y)^2(x^2-2xy+4y^2)^2=（x+2y)^2(x^2-2xy+4y^2)^2=（x+2y)^2(x^2-2xy+4y^2)^2=（x+2y)^2(x^2-2xy+4y^2)^2=
（x+2y)^2(x^2-2xy+4y^2)^2=
（x+2y)^2(x^2-2xy+4y^2)^2=
（x+2y)^2(x^2-2xy+4y^2)^2=
（x+2y)^2(x^2-2xy+4y^2)^2
=（x+2y）²（x-2y）²
=（x²-4y²）²
=x^4-8x²y²+16y^4
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