8, 8×2=16, 8×24=18, 8×4=32, 8×5=40, 8×6=48, 8×7=56, 8×8=64, 8×9=72, 8×10=80
a)8,16,24,32,40,48,56,64,72,80
b)8, 16+1=17, 24+1=25, 32+1=33, 40+1=41, 48+1=49, 56+1=57, 64+1=65, 72+1=73, 80+1=81
Sirul este: 8,17,25,33,41,49,57,65,73,81
c) 8, 16-1=15, 24-1=23, 32-1=31, 40-1=39, 48-1=47, 56-1=55, 64-1=63, 72-1=71, 80-1=79
Sirul este: 8,15,23,31,39,47,55,63,71,79
