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18. Calculaţi: a) (5⁰ +5¹ +5² +5³): 2²; c) (2⁰+2¹+2²+2³+3²): 2²; b) (7⁰ +7¹ +7²-3²): 2⁴; d) (3⁰ +3¹ +3² +3³-2³): 2³.​

18 Calculaţi A 5 5 5 5 2 C 22223 2 B 7 7 73 2 D 3 3 3 32 2 class=