Question

tìm số tự nhiên x biết: (2x +1)³ =125

ai nhanh tay nhất mik tich cho

Answer 1

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

\(\Leftrightarrow2x+1=15\)

\(\Leftrightarrow2x=14\Leftrightarrow x=7\)

Answer 2

\(\left(2x+1\right)^3=125\) 

\(\left(2x+1\right)^3=5^3\) 

\(2x+1=5\) 

\(x=2\)

Answer 3

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

\(\Leftrightarrow2x+1=5\Leftrightarrow x=2\)

Answer 4

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

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

\(\Leftrightarrow2x+1=5\)

\(\Leftrightarrow2x=4\)

\(\Leftrightarrow x=2\)

Vậy \(x=2\)

Answer 5

Nhầm 

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

\(\Leftrightarrow2x+1=5\Leftrightarrow x=2\)

Answer 6

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

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

\(\Leftrightarrow2x+1=5\)

\(\Leftrightarrow2x=4\)

\(\Leftrightarrow x=2\)

Vậy \(x=2\)

Answer 7

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

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

   \(2x+1=5\)

   \(2x=5-1\)

   \(2x=4\)

      \(x=4:2\)

      \(x=2\)