Ta có : (x - 1)3 = 125
=>(x - 1)3 = 53
=> x - 1 = 5
=> x = 5 + 1
=> x = 6
\(\left(x-1\right)^3=125\)
\(\Leftrightarrow\left(x-1\right)^3=5^3\)
\(\Leftrightarrow x-1=5\)
\(\Rightarrow x=5+1\)
\(\Rightarrow x=6\)
cho mk nha!
Vì 125 = 53
=> X - 1 = 5
=> X = 5 + 1
=> X = 6
Vậy x = 6
( x - 1 )3 = 125
( x - 1 ) 3 = 53
x - 1 = 5
x = 5 + 1
x = 6