Визнач, не виконуючи обчислень, чи ділиться сума на число без остачі а) 25 + 55 + 90 + 150 на 5; B) 21 + 60 + 510 + 1 200 на 3; 6) 12+15+16 на 2 r) 36+72+124 на 9​
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