Răspunsuri

2014-08-13T22:33:01+03:00
5x-4y/2x-y=7
aplici legea proportiilor
5x-4y=7(2x-y)
5x-4y=14x-7y
separi necunoscutele
7y-4y=14x-5x
3y=9x
imparti toata relatia la 3
y=3x
y/x=3
x/y=1/3
este 7/3 nu 7
scuze! se face la fel
3(5x-4y)=7(2x-y) 15x-12y=14x-7y 15x-14x=12y-7y x=5y x/y=5
acum e bine. Bafta!