Question

x的4次方-y的4次方分之x+除以x方+y方分之1

Answer 1

(x+y)/(x^4-y^4) ÷1/(x^2+y^2)

=(x+y)/(x^2+y^2)(x^2-y^2)÷1/(x^2+y^2)

=(x+y)/(x^2-y^2)

=(x+y)/(x+y)(x-y)

=1/(x-y)

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