Question

Tìm x trong các tỉ lệ thức :

a )\(\dfrac{x}{-15}=\dfrac{-60}{x}\)

Answer 1

\(\dfrac{x}{-15}=-\dfrac{60}{x}\left(x\ne0\right)\\ =>x^2=\left(-15\right).\left(-60\right)=900=\left(\pm30\right)^2\\ =>x=\pm30\left(TMDK\right)\)