x的4次方-y的4次方分之x+除以x方+y方分之1
问题描述：
x的4次方-y的4次方分之x+除以x方+y方分之1
答
(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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