Question

Media aritmetica a 3 numere este 4,2.
a) Aflati suma acestora
b) Aflati numerele, stiind ca sunt numere consecutive.

VA ROG!!!!!
URGENT!!!!!
Multumesc !

Answer 1

b) x+(x+1)+(x+2)/3=4.2
3x+3/3=4.2
3x+3=4.2×3
3x+3=12.6
3x=12.6-3
3x=9.6
x=9.6÷3
x=3.2
x+1=3.2+1=4.2
x+2=3.2+2=5.2
verificare
(3.2+4.2+5.2)÷3=4.2
12.6÷3=4.2
a) suma=
3.2+(3.2+1)+(3.2+2)=3.2+4.2+5.2=12.6