Question

tìm x biết:

x/3=x+2/5

*lưu ý : dấu gạch dọc là phân số nhé

Giúp mình , thanks you mn

Answer 1

Cách 1.

\(\frac{x}{3}=x+\frac{2}{5}\Leftrightarrow x\left(\frac{1}{3}-1\right)=\frac{2}{5}\) \(\Leftrightarrow-\frac{2}{3}x=\frac{2}{5}\) \(\Leftrightarrow x=-\frac{3}{5}\)

Cách 2. \(\frac{x}{3}=x+\frac{2}{5}\Leftrightarrow\frac{x}{3}.15=15\left(x+\frac{2}{5}\right)\)

\(\Leftrightarrow5x=15x+6\Leftrightarrow10x=-6\Leftrightarrow x=-\frac{3}{5}\)

Answer 2

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

\(\Rightarrow5x=3\left(x+2\right)\)

\(\Rightarrow5x=3x+6\)

\(\Rightarrow2x=6\)

\(\Rightarrow x=3\)

Vậy \(x=3\)

Answer 3

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

\(\Rightarrow5x=3\left(x+2\right)\)

\(\Rightarrow5x=3x+6\)

\(\Rightarrow2x=6\)

\(\Rightarrow x=3\)

Vậy \(x=3\)

Answer 4

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

\(\Rightarrow5x=3\left(x+2\right)\)

\(\Rightarrow5x=3x+6\)

\(\Rightarrow5x-3x=6\)

\(\Rightarrow2x=6\)

\(\Rightarrow x=3\)

Vậy : \(x=3\)