Question

Ajutatima, ofer 80 de puncte si coronita
Daca x/y=4/9 aflati 3x +2y/5x+y

Answer 1

x/y=4/9
x=4y/9
inlocuim x
(4y/3+2y)/(20y/9+y)=10y/3*9/29y=30/29

Answer 2

[tex]\frac{x}{y}=\frac{4}{9}\;\;\Leftrightarrow\;\;\frac{x}{4}=\frac{y}{9}=...\,k\\ x=4k\;\;si\;\;y=9k\;\;inlocuim\;in\;raportul\;cerut\;...\\ vom\;avea:\;\frac{3*4k+2*9k}{5*4k+9k}=\frac{30\not{k}}{29\not{k}}=30/29[/tex]