
已知x=2013,y=2014,则(x+y)(x^2+y^2)/x^4-y^4=?
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解由(x+y)(x^2+y^2)/x^4-y^4
=(x+y)(x^2+y^2)/(x^2+y^2)*(x^2-y^2)
=(x+y)/(x^2-y^2)
=(x+y)/(x-y)(x+y)
=1/(x-y)
=1/(2013-2014)
=-1
=(x+y)(x^2+y^2)/(x^2+y^2)*(x^2-y^2)
=(x+y)/(x^2-y^2)
=(x+y)/(x-y)(x+y)
=1/(x-y)
=1/(2013-2014)
=-1
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