Question

Giải phương trình:

\(\left(2\cdot x+1\right)^3=125\)

Answer 1

\(\left(2.x+1\right)^3=125\)

\(\left(2x+1\right)^3=5^3\)

\(\Rightarrow2x+1=5\)

\(2x=5-1\)

\(2x=4\)

\(x=\frac{4}{2}\)

\(x=2\)

Answer 2

(2.x+1)³=125

=> (2.x+1)³=5³

=> 2.x+1=5

     2.x    =5-1

     2.x    =4

        x    = 4:2

        x    =2

 

Answer 3

2