若(x-1)^2=4,则x=?若x^3-125=0,则x=?
问题描述:
若(x-1)^2=4,则x=?若x^3-125=0,则x=?
答
(x-1)^2=4
x-1=±√4=±2
x=1±2
x=3或x=-1
x^3-125=0
x^3=125
x=5