7. Вычисли: \(28 \cdot 3 - 57\) \(34 + 13 \cdot 5\) \(98 - 23 \cdot 4 + 24\) \(28 \cdot 2 - 13 \cdot 4\) \((49 + 28) : 7\) \((64 + 24) : 4\)

1. \(28 \cdot 3 - 57 = 84 - 57 = 27\) 2. \(34 + 13 \cdot 5 = 34 + 65 = 99\) 3. \(98 - 23 \cdot 4 + 24 = 98 - 92 + 24 = 6 + 24 = 30\) 4. \(28 \cdot 2 - 13 \cdot 4 = 56 - 52 = 4\) 5. \((49 + 28) : 7 = 77 : 7 = 11\) 6. \((64 + 24) : 4 = 88 : 4 = 22\)