Question

Numerele 3,x,y,8 sunt in progresie aritmetica. Calculati x+y.
Astept raspuns

Answer 1

3+r=x x+r=y y+r=8 Deci 3+3r=8 deci r=5/3 Dupa ce stii ratia ii simplu x=3+r= 3+5/3=14/3 y=x+r=14/3+5/3=19/3 x+y=14/3+19/3=33/3=11