(1/9)^1003=(1/3)2006=1/3^2006
(1/9)^1003*3^2008=1/3^2006*3^2008=3^2=9
(-7)^2008-14*7^2007-(-49)*7^2006
=7^2008-2*7^2008+7^2008
=0
(x+1/2)^2+|y-3|=0
因为(x+1/2)^2>=0 |y-3|>=0
所以x=-1/2,y=3
x^y=(-1/2)^3=-1/8