Question

se da proportia x/y=5/8
Aflati valoarea raportului 7x+4y/8y-2x

Answer 1

daca x/y=5/8 => x=5, y=8
7x+4y/8y-2x= 7•5+4•8/ 8•8-2•5= 35+32/64-10= 67/54= 1.24 sau 1 intreg si 13/54

Answer 2

x/y=5/8=k
x=5k
y=8k
7x+4y/8y-2x=7*5k+4*8k/8*8k-2*5k=35k+32k/64k-10k=67k/54k=67/54