Răspuns :
Răspuns:
2019²-2×2019×2020+2020² = 4.076.361 - 4038 x 2020 +4.080.400=
= 4.076.361 -8.156.760 + 4.080.400 =
=-4.080.399+4.080.400=
= 1
1)2019²=4076361
2)2020²=4080400
3)2×2019=4038
4)4038×2020=8156760
5)4076361-4038=4072323
6)4072323+4080400=8152723