My hobby is singing. It can make me ____ (happily).
如图所示,梯形ABCD中,AB∥DC,∠B=90°,AD=15,AB=16,BC=12,点E是边AB上的动点,点F是射线CD上一点,射线ED和射线AF交于点G,且∠AGE=∠DAB.
二元一次方程x+2y=7的正整数解有( )