(x+y)的四次方+(x²-y²)²+(x-y)的四次
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(x+y)^4+(x^2-y^2)^2+(x-y)^4
=(x+y)^4+(x+y)^2(x-y)^2+(x-y)^4
=(x+y)^2](x+y)^+(x-y)^2]+(x-y)^4
=(x+y)^2(2*x^2+2*y^2)+(x-y)^4
=2*x^4+2*x^2*y^2+4*x^3*y+4*x*y^3+2*x^2*y^2+2*y^2+x^4-2*x^3*y+x^2*y^2-2*x^3*y-2*x^2*y^2-2*x*y^3+x^2*y^2-2*x*y^3+y^4
=3*x^4+3*y^4+4*x^2*y^2
=(x+y)^4+(x+y)^2(x-y)^2+(x-y)^4
=(x+y)^2](x+y)^+(x-y)^2]+(x-y)^4
=(x+y)^2(2*x^2+2*y^2)+(x-y)^4
=2*x^4+2*x^2*y^2+4*x^3*y+4*x*y^3+2*x^2*y^2+2*y^2+x^4-2*x^3*y+x^2*y^2-2*x^3*y-2*x^2*y^2-2*x*y^3+x^2*y^2-2*x*y^3+y^4
=3*x^4+3*y^4+4*x^2*y^2
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