Răspuns:
(1+1000) x 1000/2=1001 x 500=500500 ; (2+220) x 110/2=222 x 55=12210 ; (5+2020) x 404/2=2025 x 202=409050 ; (3+2013) x 671/2=1008 x671`= 676368 ; (1+2018) x 2018/2=2019 x 1009 ; 2019 x 1009:2019=1009 ; 2 x (1+2019) x 2019/2:2020=2019 ; (1+14) x 14/2:(1+6) x 6/2=15 x 7:(7 x 3)= 5
Explicație pas cu pas: