Question

Tìm x biết:

\(\dfrac{-6}{x}=\dfrac{14}{-21}\)

Đáp số: x= ???

Answer 1

=> x=-21.-6:14=9

Vậy x=9

Answer 2

Ta có: (-6).(-21)=14x

=> x= \(\dfrac{126}{14}\)=9

Vậy x=9

Answer 3

ĐKXĐ: \(x\ne0\)

Ta có: \(\dfrac{-6}{x}=\dfrac{14}{-21}\)

\(\Leftrightarrow x=\dfrac{\left(-6\right)\cdot\left(-21\right)}{14}=\dfrac{126}{14}=9\)(thỏa ĐK)

Vậy: x=9