Question

Tìm \(x\)thuộc N biết 

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

các bn giúp mk nhé !

Answer 1

ta có:

(2x+1)^3=125

Suy ra 2x+1=5

         2x=5-1

         2x=4

     Suy ra x=2

    Vậy x=2

Answer 2

\(\left(2x+1\right)^3=125=5^3\)

\(\Rightarrow2x+1=5\Rightarrow x=2\)( TM)

Vậy ...

Answer 3

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

\(\Leftrightarrow2x+1=5\)

\(\Leftrightarrow2x=4\)

\(\Leftrightarrow x=2\)

Vậy x =2

Answer 4

125=5^3

=>2x+1=5

=>2x=5-1

=>2x=4
=>x=4:2

=>x=2

Vậy x bằng 2
K CHO MK NHA

Answer 5

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

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

\(2x+1=5\)

2x=5-1

2x=4

x=4:2

x=2