Question

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

Answer 1

\(\Leftrightarrow5x=3x+6\)

\(\Leftrightarrow2x=6\Leftrightarrow x=3\)

Answer 2

Ta có \(\dfrac{x}{3}=\dfrac{x+2}{5}\)

⇔ x . 5 = 3 . (x + 2)

⇔ 5x = 3x + 6

⇔ 5x - 3x = 6

⇔ 2x = 6

⇔ x = 3

Vậy, x = 3.

Answer 3

Theo đề ta có :

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

\(\Leftrightarrow x.5=\left(x+2\right).3\)

\(\Leftrightarrow x.5=x3+6\)

\(\Leftrightarrow\left[{}\begin{matrix}6=x5-x3\\6=[x.(5-3]\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}6=x.2\\x=3\end{matrix}\right.\)

Answer 4

Áp dụng tính chất dãy tỉ số bằng nhau:

\(\dfrac{x}{3}=\dfrac{x+2}{5}=\dfrac{x-x-2}{3-5}=\dfrac{-2}{-2}=1\)

\(\Rightarrow x=3\)