Question

sa da proportia x supra y = 5 supra 8 aflatiu valoarea raportului 7x+4y supra 8y-2x

Answer 1

$\frac{x}{y} = \frac{5}{8} => x= \frac{5y}{8}$

$\frac{7x+4y}{8y-2x} = \frac{ \frac{35y}{8}+4y}{8y- \frac{5y}{4} }= \frac{ \frac{67y}{8}}{ \frac{27y}{4} } = \frac{67y}{8} * \frac{4}{27y} = \frac{67}{27*2} = \frac{67}{54}$