Ответ:
а) \(6 + 6 + 6 + 6 + 6 = 6 \cdot 5 = 30\);
б) \(3 + 3 + 3 = 3 \cdot 3 = 9\);
в) \(x + x + x + x + x + x + x = x \cdot 7 = 7x\).
а) \(6 + 6 + 6 + 6 + 6 = 6 \cdot 5 = 30\);
б) \(3 + 3 + 3 = 3 \cdot 3 = 9\);
в) \(x + x + x + x + x + x + x = x \cdot 7 = 7x\).