Question

\(\dfrac{x}{2}=\dfrac{x+3}{5}\)

Tìm x , bt

Answer 1

\(\dfrac{x}{2}=\dfrac{x+3}{5}\\ \Rightarrow5x=2\left(x+3\right)\\ \Rightarrow5x=2x+6\\ \Rightarrow5x-2x=6\\ \Rightarrow3x=6\\ \Rightarrow x=\dfrac{6}{3}\\ \Rightarrow x=2\\ Vậyx=2\)

Answer 2

\(\dfrac{x}{2}=\dfrac{x+3}{5}\)

\(\Leftrightarrow5x=2.\left(x+3\right)\left(\text{tính chất tỉ lệ thức}\right)\)

\(\Leftrightarrow5x=2x+2.3\)

\(\Leftrightarrow5x=2x+6\)

\(\Leftrightarrow5x-2x=6\)

\(\Leftrightarrow3x=6\)

\(\Leftrightarrow x=6:3\)

\(\Leftrightarrow x=2\)

\(\text{Vậy }\text{x}=2\)