Question

Tìm x\(\in\) Q  : \(\frac{x}{4}=\frac{9}{12}\)  

Answer 1

\(\frac{x}{4}=\frac{9}{12}\\ \Rightarrow x.12=4.9\\ \Rightarrow x=4.9:12\\ x=3\)

Answer 2

x=9/12 * 4 =3

Answer 3

\(\frac{x}{4}=\frac{9}{12}\)

\(x=\frac{4.9}{12}\)

\(x=\frac{36}{12}\)

x=3

Answer 4

\(\frac{x}{4}=\frac{9}{12}=\frac{3}{4}\)

=> x = 3

Vậy x = 3