modul 1:
7x+14x+21x+.....+1057x=[(1057+7)x(numarul de termeni):2]x
numarul de termeni=[(1057-7):7+1]x=(1050:7+1)x=150+1=151x
[(1057+7)x151:2]x=(1064x75,5)x=80332x
modul 2:
7x+14x+21x+........+1057x=
[7(1+2+3+4+.....+151)x=
{7[151(151+1):2]}x=
[7(75,5x152)]x=(7*11476)x=80332x
Sper ca te-am ajutat!
