非零实数x、y满足(x2+2009-x)(y2+2009-y)=2009,则x+2008y/2008x+y=_.
问题描述:
非零实数x、y满足(
-x)(
x2+2009
-y)=2009,则
y2+2009
=______. x+2008y 2008x+y
答
当x+y=0,即x=-y时,(
-x)(
x2+2009
-y)=2009恒成立,
y2+2009
则
=x+2008y 2008x+y
=−y+2008y −2008y+y
=-1.2007y −2007y
故答案为:-1