Question

suma a cinci numere naturale consecutive pare este cu 10 mai mica decat produsul primelor cinci numere nenule.Cele cinci numere sunt:
a. 8,10,12,14,16. b. 9,11,13,15,17. c. 18,20,22,24,26. d. 20,26,34,36,38

Answer 1

A+(A+2)+(A+4)+(A+6)+(A+8)=1×2×3×4×5-10
5A+20=120-10=110
5A=90
A= 90:5
A=18
B=20
C=22
D=24
E=26