问题
填空题
已知x=2007，y=2008，则
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答案
÷x2+2xy+y2 5x2-4xy
+x+y 5x-4y
=x2-y x
×(x+y)2 x(5x-4y)
+5x-4y x+y
=x2-y x
+x+y x
=x2-y x
=1+x=2008．x+x2 x
故答案为：2008．
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已知x=2007，y=2008，则
|
÷x2+2xy+y2 5x2-4xy
+x+y 5x-4y
=x2-y x
×(x+y)2 x(5x-4y)
+5x-4y x+y
=x2-y x
+x+y x
=x2-y x
=1+x=2008．x+x2 x
故答案为：2008．