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9. Calculati ultima cifră a numerelor: a) 2^47, 2^129 2^2020, C) 5^2019 +7^2020), b) 21^324, 19^257; 17^2020, d) 3^2020 + 4^2018 + 5^2019 +6^2021 + 7^2020 ​