Question

x/-15 bằng -60/x

​

Answer 1

\(\frac{x}{-15}=\frac{-60}{x}\)

\(\Rightarrow x^2=\left(-60\right)\left(-15\right)\)

\(\Rightarrow x^2=900\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=\sqrt{900}\\x=-\sqrt{900}\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=30\\x=-30\end{array}\right.\)

Vậy x=30 ; x= - 30

Answer 2

\(=> x.x = -15.-60 => x^2 = 900 => x^2 = 30^2 => x=30 hoặc x=-30\)