1) (2008*x+2009*y)/(x*x+y+1)
2) 1/2/sqrt a*a+b*b
3) sqrt 2*x+sqrt 2*x+1
4) x-1/(1+5*x+y*y)-abs y +1
5) sqrt 2*x*x+abs x -1
6) sqrt a*a+1+sqrt x-2 sqrt y*y
7) sqrt 2*x*x+abs x-1
8) sqrt a*a+1+sqrt x-2 sqrt yay
9) (2008*x+(2009/x)/x*x+1)
10) sqrt a*a+b+x/y