三次根号x-2+2=x
=>x-2=(x-2)³
=>(x-2)[1-(x-2)²]=(x-2)(-x²+4x+5)=-(x-2)(x-5)(x+1)=0
=>x=-1,2,5
三次根号3y-1与三次根号1-2x互为相反数
=>3y-1=2x-1
=>y=(2/3)x
∴x=-1,y=-2/3
x=2,y=4/3
x=5,y=10/3你做的这题三次根号x-2+2=x，的“+2”是在三次根号外吗？？是