√x^3=4,∴x=2^(4/3).（y-2z+1）^+√(z-3)^4=0,∴y-2z+1=0,z-3=0,∴z=3,y=5.∴√x+y^3+z^3=2^(2/3)+125+27=2^(2/3)+152.
