Question

$stiind \: ca \: \frac{5a + 4b}{5a + 7b} = \frac{2}{3} calculati \: \frac{b}{a + b}$
Am nevoie de puțin ajutor. Deoarece nu stiu a doilea pas.​

Answer 1

Răspuns:

3(5a+4b)=2(5a+7b)

15a+12b=10a+14b

15a-10a=14b-12b

5a=2b=>a/5=b/2=k

a=5k

b=2k

b/(a+b)=2k/(5k+7K)=2k/12k=1/6

Answer 2

Răspuns:

Succes! Sper ca te am ajutat..........