y-2x=0,求代数式(x^2-y^2)(x^2-xy+y^2)/(x+Y)(x^3-y^3)的值

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y-2x=0,求代数式(x^2-y^2)(x^2-xy+y^2)/(x+Y)(x^3-y^3)的值y-2x=0,求代数式(x^2-y^2)(x^2-xy+y^2)/(x+Y)(x^3-y^3)的值y-

y-2x=0,求代数式(x^2-y^2)(x^2-xy+y^2)/(x+Y)(x^3-y^3)的值
y-2x=0,求代数式(x^2-y^2)(x^2-xy+y^2)/(x+Y)(x^3-y^3)的值

y-2x=0,求代数式(x^2-y^2)(x^2-xy+y^2)/(x+Y)(x^3-y^3)的值
y=2x带入后面式子
(x^2-4x^2)(x^2-2x^2+4x^2)/(3x)(x^3-8x^3)=-9x^4/-21x^4=3/7