Question

Tìm x, biết:

x/ -15 = -60/x

Answer 1

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

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

\(\Rightarrow x^2=900\)

\(\Rightarrow x=\sqrt{900}\)

\(x=30\)

Answer 2

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

\(\Rightarrow x\cdot x=\left(-60\right)\cdot\left(-15\right)\)

\(\Rightarrow x^2=900\)

=>x²=(-30)² hoặc 30²

=>x=30 hoặc -30

Answer 3

Giải:

\(\frac{x}{-15}=\frac{-60}{x}\Rightarrow x^2=\left(-15\right).\left(-60\right)\)

\(\Rightarrow x^2=900\)

\(\Rightarrow x^2=30^2\)

\(\Rightarrow x=\pm30\)

Vậy \(x=\pm30\)

Answer 4

\(-\frac{x}{15}=\frac{-60}{x}ĐK:x\ne0\\ \Leftrightarrow-x^2=-900\Leftrightarrow x^2=900\Leftrightarrow x=\pm30\)