1) 7b + 5b = (5 + 7) • b = 12b;
2) 9a – 4a = (9 – 4) • a = 5a;
3) 7x + 2x – x = (7 + 2 – 1) • x = 8x;
4) 19b – 5b – 7b = (19 – 5 – 7) • b = 7b.
Завдання №334
Спрости вираз.
1) 7b + 5b = (5 + 7) • b = 12b;
2) 9a – 4a = (9 – 4) • a = 5a;
3) 7x + 2x – x = (7 + 2 – 1) • x = 8x;
4) 19b – 5b – 7b = (19 – 5 – 7) • b = 7b.