Question

cho 3x-y/x+y=3/4. tinh x/y

 

Answer 1

\(\frac{3x-y}{x+y}=\frac{3}{4}\)

\(\left(3x-y\right)4=\left(x+y\right)3\)

\(12x-4y=3x+3y\)

\(12x-3x=3y+4y\)

\(9x=7y\)

\(\frac{x}{y}=\frac{7}{9}\)

Answer 2

\(3x-\frac{y}{x}+y=\frac{3}{4}\) hả

Answer 3

hay là \(\frac{3x-y}{x+y}=\frac{3}{4}\) này chắc đúng

Answer 4

Ta có: \(\frac{3x-y}{x+y}=\frac{3}{4}\)

=> 4(3x - y) = 3(x + y)

=> 12x - 4y = 3x + 3y

=> 12x - 3x =   3y + 4y

=> (12 - 3)x = (3 + 4)y

=> 9x = 7y

=> x/y = 7/9

Vậy x/y = 7/9