问题
解答题
已知x=2007,y=2008,求
|
答案
原式=
•(x+y)2 x(5x-4y)
+5x-4y x+y x2-y x
=
+x+y x x2-y x
=x2+x x
=x+1.
当x=2007时,原式=2007+1=2008.
已知x=2007,y=2008,求
|
原式=
•(x+y)2 x(5x-4y)
+5x-4y x+y x2-y x
=
+x+y x x2-y x
=x2+x x
=x+1.
当x=2007时,原式=2007+1=2008.