当x=,y=2008时,代数式(x4-y4)/(x2-2xy-y2)/(x2+y2)/(y-x)的值(不用过程 给个答案就行)
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当x=,y=2008时,代数式(x4-y4)/(x2-2xy-y2)/(x2+y2)/(y-x)的值(不用过程 给个答案就行)
当x=,y=2008时,代数式(x4-y4)/(x2-2xy-y2)/(x2+y2)/(y-x)的值(不用过程 给个答案就行)
当x=,y=2008时,代数式(x4-y4)/(x2-2xy-y2)/(x2+y2)/(y-x)的值(不用过程 给个答案就行)
x=?
化简=-(x+y)
自己算一下吧