a) 3b + (5a - 7b) б) -(8c - 4) + 4 в) (2 + 3x) + (7x - 2) г) 3(8m - 4) + 6m д) 15 - 5(1 - a) - 6a е) (2a - 7y) - (5a - 7y) ж) 14b - (15b + y) - (y + 10b) з) 7(5a + 8) - 11a и) 9x + 3(15 - 8x) к) 33 - 8(11b - 1) - 2b

Краткое пояснение:

Пошаговое решение:

• a) 3b + (5a - 7b) = 3b + 5a - 7b = 5a + (3-7)b = 5a - 4b
• б) -(8c - 4) + 4 = -8c + 4 + 4 = -8c + 8
• в) (2 + 3x) + (7x - 2) = 2 + 3x + 7x - 2 = (3+7)x + (2-2) = 10x
• г) 3(8m - 4) + 6m = 24m - 12 + 6m = (24+6)m - 12 = 30m - 12
• д) 15 - 5(1 - a) - 6a = 15 - 5 + 5a - 6a = (15-5) + (5-6)a = 10 - a
• е) (2a - 7y) - (5a - 7y) = 2a - 7y - 5a + 7y = (2-5)a + (-7+7)y = -3a
• ж) 14b - (15b + y) - (y + 10b) = 14b - 15b - y - y - 10b = (14-15-10)b + (-1-1)y = -11b - 2y
• з) 7(5a + 8) - 11a = 35a + 56 - 11a = (35-11)a + 56 = 24a + 56
• и) 9x + 3(15 - 8x) = 9x + 45 - 24x = (9-24)x + 45 = -15x + 45
• к) 33 - 8(11b - 1) - 2b = 33 - 88b + 8 - 2b = (33+8) + (-88-2)b = 41 - 90b

Ответ: a) 5a - 4b; б) -8c + 8; в) 10x; г) 30m - 12; д) 10 - a; е) -3a; ж) -11b - 2y; з) 24a + 56; и) -15x + 45; к) 41 - 90b