(1)若点A(a+1,b-2)在第二象限,则化简√(a+1)^2-√(b+5)^2=
(2)若(√x-12)+(y-8)^2=0,则√x/y=
(3)当x=____,二次根式√x+1有最小值,其最小值为_____
(4)已知x+y=5,xy=3,那么(x√y/x)+(y√x/y)结果是_____