Question

tìm x 4/x+2 = 7/3x+1

 

Answer 1

=>12x+4=7x+14

=>5x=10

=>x=2

Answer 2

4.(3x + 1) = 7.(x + 2)

12x + 4 = 7x + 14

12x - 7x = 14 - 4

5x = 10

x = 10 : 5

x = 2

Vậy x = 2

Answer 3

\(\dfrac{4}{x+2}=\dfrac{7}{3x+1}\)
\(=>4\left(3x+1\right)=\left(x+2\right)7\)
\(=>12x+4=7x+14\)
\(=>12x-7x=14-4\)
\(=>5x=10\)
\(=>x=2\)

Answer 4

`4/(x+2) = 7/(3x+1)`

Đk: `{(x + 2 ne 0), (3x + 1 ne 0):} <=> {(x ne -2), (x ne -1/3):}`

`-> 7x + 14 = 12x + 4`

`-> 10 = 5x`

`-> x = 2 (tm)`