\(\left(2x+1\right)^3=125\)
\(\Rightarrow\left(2x+1\right)^3=5^3\)
\(\Rightarrow2x+1=5\)
\(\Rightarrow2x=5-1\)
\(\Rightarrow2x=4\)
\(\Rightarrow x=\dfrac{4}{2}\)
\(\Rightarrow x=2\)
Vậy: x=2
( 2x + 1 ) mũ 3 = 125
( 2x + 1 ) mũ 3 = 5 mũ 3
2x + 1 = 5
2x = 5 - 1
2x = 4
x = 4 : 2
x = 2