(2x+3)^2≥0,根号(y-2)≥0
(2x+3)^2 与 根号(y-2) 互为相反数
∴2x+3=y-2=0
x=-3/2,y=2
±根号(x^y) = ±根号[(-3/2)^2] = ±根号[(3/2)^2] = ±3/2