Question

tìm x thuộc Z biết x/5=125/x

Answer 1

Có : \(\dfrac{x}{5}=\dfrac{125}{x}\)

\(\Leftrightarrow x^2=5.125\)

\(\Leftrightarrow x=\pm25\)

Answer 2

Có : \(\dfrac{x}{5}=\dfrac{125}{x}\)

\(\Leftrightarrow x^2=5.125\)

\(\Leftrightarrow x=\pm25\)