Question

  
từ 4 đến 6 ạ mik c.onnn

Answer 1

4: \(\dfrac{-15}{21}=\dfrac{-10}{14}\)

=>\(\dfrac{-15}{-10}=\dfrac{21}{14};\dfrac{-10}{-15}=\dfrac{14}{21};\dfrac{21}{-15}=\dfrac{14}{-10}\)

5: \(\dfrac{x}{4}=\dfrac{y}{7}\)

=>\(\dfrac{x}{y}=\dfrac{4}{7};\dfrac{4}{x}=\dfrac{7}{y};\dfrac{y}{x}=\dfrac{7}{4}\)

6: \(\dfrac{x}{y}=\dfrac{0.5}{3.5}\)

=>\(\dfrac{x}{0.5}=\dfrac{y}{3.5};\dfrac{0.5}{x}=\dfrac{3.5}{y};\dfrac{y}{x}=\dfrac{3.5}{0.5}\)