当x=2007,y=2008时,代数式x4-y4/(x2-2xy-y2) /(x2+y2)/(y-x)

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当x=2007,y=2008时,代数式x4-y4/(x2-2xy-y2) /(x2+y2)/(y-x)
当x=2007,y=2008时,代数式x4-y4/(x2-2xy-y2) /(x2+y2)/(y-x)

当x=2007,y=2008时,代数式x4-y4/(x2-2xy-y2) /(x2+y2)/(y-x)
把偶数都提出来!就剩1的加减了笨