Question

ajutati-ma, va rog!​

Answer 1

Răspuns:

Explicație pas cu pas:

x+y=10

$\frac{x+2y}{3x+5y+6} =\frac{2x+3y+4}{5x+7y+28} ,~\frac{x+y+y}{3x+3y+2y+6}=\frac{2x+2y+y+4}{5x+5y+2y+28} ,~\frac{10+y}{30+2y+6} =\frac{20+y+4}{50+2y+28},~\frac{10+y}{36+2y}=\frac{24+y}{78+2y} ,~ (10+y)(78+2y)=(36+2y)(24+y)$

(10+y)(39+y)=(18+y)(24+y); deoarece x+y=10, deci y<10 si prin incercari gasim y=6, atunci x=4