Номер 350
Розкрийте дужки:
1) 7(х + 5) = 7 • х + 7 • 5 = 7x + 35
2) 3(b – 3) = 3 • b – 3 • 3 = 5b – 9
3) (4 + a) • 8 = 4 • 8 + a • 8 = 32 + 8a
4) (b – 2) • 7 = b • 7 – 2 • 7 = 7b – 14
5) 7(a + b) = 7 • a + 7 • b = 7a + 7b
6) 5(a + 2 – c) = 5 • a + 5 • 2 – 5 • c = 5a + 10 – 5c