Question

Tìm x biết;

3x/9=2/5

Answer 1

3x=2/5 *9

3x=18/5

x=18/5 :3

x=6/5

Answer 2

\(\frac{3x}{9}=\frac{2}{5}\Rightarrow5.3x=2.9\)

\(\Rightarrow15x=18\)

\(\Rightarrow x=18:15=\frac{6}{5}\)

Answer 3

\(\frac{3.x}{9}=\frac{2}{5}\)

\(\frac{3.x.5}{9.5}=\frac{2.9}{5.9}\)

\(\frac{15.x}{45}=\frac{18}{45}\)

\(\Rightarrow15.x=18\)

\(\Rightarrow x=18:15\)

\(\Rightarrow x=1,2\)

k nha