Răspuns :
Cele 3 numere sunt in progresie aritmetica daca:
[tex] \frac{(x-3)+(x+3)}{2} =4=> \frac{2x}{2} =4=>x=4[/tex]
Numerele sunt:1,4,7.
[tex] \frac{(x-3)+(x+3)}{2} =4=> \frac{2x}{2} =4=>x=4[/tex]
Numerele sunt:1,4,7.
[tex]4 = \frac{x-3+x+3}{2}[/tex]
[tex]4 = \frac{2x}{2} [/tex]
[tex]x = 4[/tex]
[tex]4 = \frac{2x}{2} [/tex]
[tex]x = 4[/tex]