Question

Va rog repede

Fie
a supra b = 7 supra 5
Valoarea raportului 3a-2b supra a+b este...

Answer 1

$\frac{a}{b} = \frac{7}{5} \\ a = \frac{7b}{5 } \\ \frac{3a - 2b}{a + b} = \frac{3 \times \frac{7b}{5} - 2b}{ \frac{7b}{5} + b} = \frac{ \frac{21b - 10b}{5} }{ \frac{7b + 5b}{5} } = \frac{11b}{5} \times \frac{5}{12b} = \frac{11}{12}$

Answer 2

==================================