Question

Afla trei nr stiind ca doua cate doua au media aritmetica egala cu 39,50,24

Answer 1

Sunt 3 numere :  x, y, z

(x+y)/2=39            (y+z)/2=50             (x+z)/2=24

x+y=78                   y+z=100                x+z=48

x=78-y                    y+z=100               78-y+z=48

x=78-y                    y+z=100               y-z=30

Din 3 ecuatii obtinem 2 ecuatii:

y+z=100            y-z=30     le adunam

2y=130                             y=65       z=100-65=35      x=48-35=13

Numerele sunt   13, 65 , 35