Задание 2. Найдите значение выражений.

1) 2(3x + 5) - 4(x - 2) при x = 3: 2(9 + 5) - 4(3 - 2) = 28 - 4 = 24. 2) 5(2a + 3b) - 3(4a - b) + 2(b + a) при a = 7, b = 2: 5(14 + 6) - 3(28 - 2) + 2(2 + 7) = 100 - 78 + 18 = 40. 3) 2(a + 3c) + 4(2a + c) при a = 8, c = 1: 2(8 + 3) + 4(16 + 1) = 22 + 68 = 90. 4) 2(x + 3y) - 3(y - 2x) + 4(y + 1) при x = 3, y = 2: 2(3 + 6) - 3(2 - 6) + 4(2 + 1) = 18 + 12 + 12 = 42.