x^2·(2x+y)·(2x-y)+x^2· y^2
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x^2·(2x+y)·(2x-y)+x^2·y^2x^2·(2x+y)·(2x-y)+x^2·y^2x^2·(2x+y)·(2x-y)+x^2·y^2x^2*(2x+y)*(2x-y)+x^2*y^2
x^2·(2x+y)·(2x-y)+x^2· y^2
x^2·(2x+y)·(2x-y)+x^2· y^2
x^2·(2x+y)·(2x-y)+x^2· y^2
x^2*(2x+y)*(2x-y)+x^2* y^2
=x^2*(4x^2-y^2)+x^2* y^2
=x^2*(4x^2-y^2+y^2)
=x^2*4x^2
=4x^4
x2*(4x2-y2)+x2y2=4X4(4X四次方)
原式=2xn(4x2-y2)+4xnyn
原式=X2(4X2-Y2）+X2Y2
＝4X4
=x^2·(4x^2-y^2)+x^2· y^2
=x^2·(4x^2-y^2+y^2)
=4x^4
x^2·(2x+y)·(2x-y)+x^2· y^2
=x^2[(2x)^2-y^2]+x^2y^2
=4x^4-x^2y^2+x^2y^2
=4x^4
=4x^4
过程：
原式=x^2(4x^2-y^2)+x^2y^2
=4x^4-x^2y^2=x^2y^2
=4x^4
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