Question

Помогите пожалуйста!решить надо всё

Answer 1

$4.$

$1)$

$a) \: \: \: \: \: 3b + (5a - 7b) = 3b + 5a - 7b = 5a - 4b$

$б) \: \: \: \: \: - 3q - (8p - 3q) = - 3q - 8p + 3q = - 8p$

$в) \: \: \: \: \: 5x + (11 - 7x) = 5x + 11 - 7x = 11 - 2x$

$- (8c - 4) + 4 = - 8c + 4 + 4 = 8 - 8c$

$2)$

$a) \: \: \: \: \: (2 + 3a) + (7a - 2) = 2 + 3a + 7a - 2 = 10a$

$б) \: \: \: \: \: - (11a + b) - (12a - 3b) = - 11a - b - 12a + 3b = 2b - 23a$

$в) \: \: \: \: \: (5 - 3b) + (3b - 11) = 5 - 3b + 3b - 33 = - 27$

$г) \: \: \: \: \: (5a - 3b) - (2 + 5a - 3b) = 5a - 3b - 2 - 5a + 3b = - 2$

$3)$

$a) \: \: \: \: \: a + (a - 10) - (12 + a) = a + a - 10 - 12 - a = a - 22$

$б) \: \: \: \: \: (6x - 8) - 5x - (4 - 9x) = 6x - 8 - 5x - 4 + 9x = 10x - 12$

$в) \: \: \: \: \: (1 - 9y) - (22y - 4) - 5 = 1 - 9y - 22y + 4 - 5 = - 31y$

$г) \: \: \: \: \: 5b - (6b + a) - (a - 6b) = 5b - 6b - a - a + 6b = 5b - 2a$

$5.$

$1)$

$a) \: \: \: \: \: 3(8a - 4) + 6a = 24a - 12 + 6a = 30a - 12$

$б) \: \: \: \: \: 11c + 5(8 - c) = 11c + 40 - 5c = 6c + 40$

$в) \: \: \: \: \: 2(y - 1) - 2y + 12 = 2y - 2 - 2y + 12 = 10$

$г) \: \: \: \: \: 16 + 3(2 - 3y) + 8y = 16 + 6 - 9y + 8y = 22 - y$

$2)$

$a) \: \: \: \: \: 7p - 2(3p - 1) = 7p - 6p + 2 = p + 2$

$б) \: \: \: \: \: - 4(3a + 2) + 8 = - 12a - 8 + 8 = - 12a$

$в) \: \: \: \: \: 3 - 17a - 11(2a - 3) = 3 - 17a - 22a + 33 = - 39a + 36$

$г) \: \: \: \: \: 15 - 5(1 - a) - 6a = 15 - 5 + 5a - 6a = 10 - a$

$6.$

$a) \: \: \: \: \: a - (a - (2a - 4)) = a - (a - 2a + 4) = a - ( - a + 4) = a + a + 4 = 2a + 4$

$б) \: \: \: \: \: 7x - ((y - x) + 3y) = 7x - (y - x + 3y) = 7x - (4y - x) = 7x - 4y + x = 8x - 4y$

$в) \: \: \: \: \: 4y - (3y - (2y - (y + 1))) = 4y - (3y - (2y - y - 1)) = 4y - (3y - (y - 1) = 4y - (3y - y + 1) = 4y - (2y + 1) = 4y - 2y - 1 = 2y - 1$

$г) \: \: \: \: \: 5c - (2c - ((b - c) - 2b)) = 5c - (2c - (b - c - 2b)) = 5c - (2c - ( - c - b)) = 5c - (2c + c + b) = 5c - (3c + b) = 5c - 3c - b = 2c - b$

$7.$

$a) \: \: \: \: \: 0.6a + 0.4(a - 55) = 0.6a + 0.4a - 22 = a - 22$

$a = - 8.3$

$a - 22 = - 8.3 - 22 = - 30.3$

$б) \: \: \: \: \: 1.3(2a - 1) - 16.4 = 2.6a - 1.3 - 16.4 = 2.6a - 17.7$

$a = 6.5$

$2.6a - 17.7 = 2.6 \times 6.5 - 17.7 = 16.9 - 17.7 = - 0.8$

$в) \: \: \: \: \: 1.2(a - 7) - 1.8(3 - a) = 1.2a - 8.4 - 5.4 + 1.8a = 3a - 13.8$

$a = 4 \frac{1}{3}$

$3a - 13.8 = 3 \times 4 \frac{1}{3} - 13.8 = 3 \times \frac{13}{3} - 13.8 = 13 - 13.8 = - 0.8$

$г) \: \: \: \: \: 2 \frac{1}{3} (a + 6) - 7 \frac{2}{3} (3 - a) = \frac{7}{3} a + 14 - 23 + \frac{23}{3} a = \frac{30}{3} a - 9 = 10a - 9$

$a = - 0.7$

$10a - 9 = 10 \times ( - 0.7) - 9 = - 7 - 9 = - 16$

Answer 2

Ответ:

не смогла решить 7В, извиняюсь.