Răspuns :
Explicație pas cu pas:
2021+2×(6....+2020)
2022×6+2020
12.032+2020
14.042
Răspuns:
2021+2×(1+2+3+....+2020)=
2021+2·[2020·(2020+1)]/2=
2021+2·(2020·2021)/2=
2021+2020·2021=
2021·(1+2020·1)=
2021·2021=2021² este pp
Explicație pas cu pas:
2021+2×(6....+2020)
2022×6+2020
12.032+2020
14.042
Răspuns:
2021+2×(1+2+3+....+2020)=
2021+2·[2020·(2020+1)]/2=
2021+2·(2020·2021)/2=
2021+2020·2021=
2021·(1+2020·1)=
2021·2021=2021² este pp