Question

Tím số tự nhiên x biết rằng :

( 2x +1) mủ 3 = 125

Answer 1

(2x+1)^3=5^3

=>th1: 2x+1=5 =>. 2x=4 =>x=2

th2: 2x+1=-5 => 2x=-6 =>x=-3

vậy x=2 hoặc x=-3

Answer 2

( 2x + 1 )³ = 125

( 2x + 1 )³ = 5³

=> 2x + 1 = 5

2x = 5 - 1

2x = 4

x = 4 : 2

x = 2

Vậy x = 2

=))

Answer 3

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

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

\(\Leftrightarrow2x+1=5\)

\(\Leftrightarrow2x=5-1\)

\(\Leftrightarrow2x=4\)

\(\Leftrightarrow x=4:2\)

\(\Leftrightarrow x=2\)

~ rất vui vì giúp đc bn ~

Answer 4

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

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

\(\Rightarrow2x+1=5\)

\(\Rightarrow2x=4\)

\(\Rightarrow x=2\)

Study well 

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 = 2