Question

 Giá trị của 𝑥 là bao nhiêu nếu (𝑥 + 2): 2 = (5𝑥 - 8): 4.

Answer 1

\(\left(x+2\right):2=\left(5x-8\right):4\)

\(\Leftrightarrow\dfrac{x+2}{2}=\dfrac{5x-8}{4}\)

\(\Leftrightarrow2\left(x+2\right)=5x-8\)

`<=>2x+4=5x-8`

`<=>3x=12`

`<=>x=4`

Vậy `S={4}`

 

Answer 2

<=> \(\dfrac{x+2}{2}=\dfrac{5x-8}{4}\)

<=> \(\dfrac{2\left(x+2\right)}{4}=\dfrac{5x-8}{4}\)

<=> \(2x+4=5x-8\)

<=> \(2x+4-5x+8=0\)

<=> \(12-3x=0\)

=> 3x = 12 

=> x = 4

Answer 3

\(\dfrac{x+2}{2}=\dfrac{5x-8}{4}\\ \Leftrightarrow\dfrac{2\left(x+2\right)}{4}=\dfrac{5x-8}{4}\\ \Leftrightarrow2x+4=5x-8\\ \Leftrightarrow2x-5x=-8-4\\ \Leftrightarrow-3x=-12\\ \Leftrightarrow3x=12\\ \Leftrightarrow x=4\)