1) 2a + 3a; 2) 7x - 15x; 3) -17b - 3b; 4) - 2,1y + 7y; 5) - 2,5x + x; 6) -a - 0,8a; 7) (1/3)x - 2x; 8) (1/2)a + (1/5)a; 9) (5/6)b - b...

### Упрощение выражений: 1) 2a + 3a = 5a 2) 7x - 15x = -8x 3) -17b - 3b = -20b 4) -2,1y + 7y = 4,9y 5) -2,5x + x = -1,5x 6) -a - 0,8a = -1,8a 7) (1/3)x - 2x = - (5/3)x = -1(2/3)x 8) (1/2)a + (1/5)a = (5/10)a + (2/10)a = (7/10)a = 0,7a 9) (5/6)b - b = -(1/6)b 10) 8b + 12b - 21b + b = 0 11) -13c + 12c + 40c - 18c = 21c 12) -p - p - p - 3p - p - p = -8p 13) 4,14a + 8,73a + 5,8a - a = 17,67a 14) 10a - a - b + 7b = 9a + 6b 15) -15c - 15a + 8a + 4c = -11c - 7a 16) 0,3x + 1,6y - 0,3x - 0,4y = 1,2y 17) x + y - x - y + 4 = 4 18) 5 - a + 4a - b - 6a = 5 - 3a - b 19) 1,2c + 1 - 0,6y - 0,8 - 0,2c = 1c - 0,6y + 0,2 = c - 0,6y + 0,2 ### 6. Раскрытие скобок: 1) c + (a + b) = c + a + b 2) c - (a - b) = c - a + b 3) c - (a + b) = c - a - b 4) -c - (-a + b) = -c + a - b 5) (a - b) - (c - d) = a - b - c + d 6) (a - b) + (c - d) = a - b + c - d 7) x - (a - b) + (c - d) = x - a + b + c - d 8) 10 - (a - b) - (c + d) = 10 - a + b - c - d ### 7. Раскрытие скобок и приведение подобных слагаемых: 1) 3b + (5a - 7b) = 3b + 5a - 7b = 5a - 4b 2) -3q - (8p - 3q) = -3q - 8p + 3q = -8p 3) 5x + (11 - 7x) = 5x + 11 - 7x = -2x + 11 4) -(8c - 4) + 4 = -8c + 4 + 4 = -8c + 8 5) (2 + 3a) + (7a - 2) = 2 + 3a + 7a - 2 = 10a 6) -(11a + b) - (12a - 3b) = -11a - b - 12a + 3b = -23a + 2b 7) (5 - 3b) + (3b - 11) = 5 - 3b + 3b - 11 = -6 8) (5a - 3b) - (2 + 5a - 3b) = 5a - 3b - 2 - 5a + 3b = -2 9) a + (a - 10) - (12 + a) = a + a - 10 - 12 - a = a - 22 10) (6x - 8) - 5x - (4 - 9x) = 6x - 8 - 5x - 4 + 9x = 10x - 12 11) (1 - 9y) - (22y - 4) - 5 = 1 - 9y - 22y + 4 - 5 = -31y 12) 5b - (6b + a) - (a - 6b) = 5b - 6b - a - a + 6b = 5b - 2a