Question

giúp mik 3,4,5 mik đang cần gấp

Answer 1

Bài 4: 

a: \(\dfrac{x}{0.9}=\dfrac{5}{6}\)

\(\Leftrightarrow x=\dfrac{5}{6}\cdot\dfrac{9}{10}=\dfrac{3}{4}\)

b: \(\dfrac{-6}{x}=\dfrac{9}{-15}\)

\(\Leftrightarrow x=\dfrac{-6\cdot\left(-15\right)}{9}=10\)