³√x=4
x=64
（y-2z+1）²+√z-3=0
z-3=0
z=3
y-2z+1=0
y=2z-1=6-1=5
x+y³+z³的立方根
=(64+5³+3³)的立方根
=（64+125+27）的立方根
=216的立方根
=6