x+y-x=0求证x^3+8y^3=z^3-6xyz
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x+y-x=0求证x^3+8y^3=z^3-6xyz
x+y-x=0求证x^3+8y^3=z^3-6xyz
x+y-x=0求证x^3+8y^3=z^3-6xyz
z=x+y
z^3-6xyz
=(x+y)^3-6xy(x+y)
=x^3+3x^2y+3xy^2+y^3-6x^2y-6xy^2
=(x-y)^3
只能推到这里,
x^3+8y^3=z^3-6xyz
随便带入 就知道不成立
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