（x^2+y^2)（x^2-y^2)-(x+y)^2(x-y)^2,其中x=4,y+1.
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（x^2+y^2)（x^2-y^2)-(x+y)^2(x-y)^2 平方差
=[(x²)²-(y²)²]-[(x+y)(x-y)]²
=(x^4-y^4)-(x²-y²)²
=(x^4-y^4)-(x^4-2x²y²+y^4)
=2x²y²-2y^4
=2y²(x²-y²)
=2y²(x-y)(x+y)
=2*1*3*5
=30
=[(x²)²-(y²)²]-[(x+y)(x-y)]²
=(x^4-y^4)-(x²-y²)²
=(x^4-y^4)-(x^4-2x²y²+y^4)
=2x²y²-2y^4
=2y²(x²-y²)
=2y²(x-y)(x+y)
=2*1*3*5
=30
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