Question

ma puteți ajuta cu aceste doua puncte ( 1si2)​

Answer 1

Răspuns:

$1)x =0.8y \\ \frac{3 \times 0.8y + 5y}{2 \times 0.8y + 7y} = \frac{2.4y + 5y}{1.6y + 7y} = \frac{7.4y}{8.6y} = \frac{7.4}{8.6} = \frac{74 }{86} = \frac{37}{43}$

$2)(2x + 3y) \times 3 = 8 \times (5x - y) \\ 6x + 9y = 40x - 8y \\ 9y + 8y = 40x - 6x \\ 34 x = 17y \\ x = \frac{17y}{34} = \frac{1}{2} \times y = 0.5y \\ \frac{x}{y} = \frac{0.5y}{y} = 0.5$