a) Daca ( apropo linia / inseamna linie de fractie pt.toate )
220 / 88 = 10/8=5/4
b) Daca 4 / x = y / 3 , x diferit de 0 , atunci determinati valoarea expresiei 3xy -7 .
xy=12
3x12-7=29
(10a+1+10b+7+10c+3)/(10a+2+10b+4+10c+5)=
(10a+10b+10c+11)/(10a+10b+10c+11) = 1