Задача 2 Распределительное свойство умножения относительно сложения:
А) a • b = b • a;    B) a + b = b + a;    C) (a + b) + c = a + (b + c);
D) (a + b) • c = a • c + b • c;    E) (a • b) • c = a • (b • c).​
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