Question

\(\dfrac{3}{x-7}=\dfrac{27}{135}\)

Answer 1

`@` `\text {Ans}`

`\downarrow`

`3/(x-7) = 27/135`

`3/(x - 7) = 1/5`

`3 \times 5 = (x - 7) \times 1`

`15 = x - 7`

`x - 7 = 15`

`x = 15 + 7`

`x = 22`

Vậy, `x = 22.`

Answer 2

\(\dfrac{3}{x-7}=\dfrac{27}{135}\) (ĐK: \(x\ne7\))

\(27\times\left(x-7\right)=3\times135\)

\(27\times x-189=405\)

\(27\times x=405+189\)

\(27\times x=594\)

\(x=594:27\)

\(x=22\)