(x+y)分之(x^2+2xy+y^2)乘 (x^2+y^2)除 (y-1)分之(x^4-y^4)

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(x+y)分之(x^2+2xy+y^2)乘(x^2+y^2)除(y-1)分之(x^4-y^4)(x+y)分之(x^2+2xy+y^2)乘(x^2+y^2)除(y-1)分之(x^4-y^4)(x+y)分

(x+y)分之(x^2+2xy+y^2)乘 (x^2+y^2)除 (y-1)分之(x^4-y^4)
(x+y)分之(x^2+2xy+y^2)乘 (x^2+y^2)除 (y-1)分之(x^4-y^4)

(x+y)分之(x^2+2xy+y^2)乘 (x^2+y^2)除 (y-1)分之(x^4-y^4)
(x+y)分之(x^2+2xy+y^2)乘 (x^2+y^2)除 (y-1)分之(x^4-y^4)
=[(x^2+2xy+y^2)/(x+y) ] * (x^2+y^2)* [(y-1)/(x^4-y^4)]
=(x+y)*[(y-1)/(x^2-y^2)]
=(y-1)/(x-y)