По интересному методу "х²-(х-1)² = х+(х-1)
1) 2020² - 2019² = 2020+2019 = 4039
2) 2019² - 2018² = 2019+2018 = 4037
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По интересному методу "х²-(х-1)² = х+(х-1)
1) 2020² - 2019² = 2020+2019 = 4039
2) 2019² - 2018² = 2019+2018 = 4037