Question

pls ajutati-ma pls pls pls pls pls pls pls​

Answer 1

Salut.

x-y/x+y = 3/5

Inmultim mezii cu extremii si avem 5x-5y = 3x+3y <=> 2x-8y=0 <=> 2x = 8y <=> x = 4y

Inlocuim in a 2a ecuatie:
2x+y/x+8y <=> 9y/12y <=> 9/12

9/12 = 3/4 = 75/100 = 0,75

0,75 ≈ 0,8

Succes

Answer 2

Explicație pas cu pas:

$\dfrac{x - y}{x + y} = \dfrac{3}{5}$

$\dfrac{(x - y) + (x + y)}{(x + y) - (x - y)} = \dfrac{3 + 5}{5 - 3}$

$\dfrac{2x}{2y} = \dfrac{8}{2} \iff \dfrac{x}{y} = 4 \implies x = 4y$

$\dfrac{2x + y}{x + 8y} = \dfrac{8y + y}{4y + 8y} = \dfrac{9y}{12y} = \dfrac{3}{4} = 0.75$

$\dfrac{2x + y}{x + 8y} \approx 0.8$