Question

Допоможіть будь ласка!!!СРОЧНО!!!​

Answer 1

Ответ:

1) 16 2) 8 3) -8 4) -3 5) -1/3 6) 48 7) -3/5 9) -7 10) -7

11) -4,6

Пошаговое объяснение:

$1) - 4 + x = 12$

$x = 12 + 4$

$x = 16$

Перевiрка:

$2) - 4 + 16 = 12$

$12 = 12$

$12 - 12 = 0$

0=0

$2) - 4 - x = - 12$

$- x = - 12 + 4$

$- x = - 8$

$x = 8$

Перевiрка:

$- 4 - 8 = - 12$

$- 12 = - 12$

$- 12 + 12 = 0$

$0 = 0$

$3)x - 4 = - 12$

$x = - 12 + 4$

$x = - 8$

Перевiрка:

$- 8 - 4 = - 12$

$- 12 = - 12$

$- 12 + 12 = 0$

$0 = 0$

$4)4x = - 12$

$x = - 12 \div 4$

$x = - 3$

Перевiрка:

$4 \times ( - 3) = - 12$

$- 12 = - 12$

$- 12 + 12 = 0$

$0 = 0$

$5) - 4 \div x = 12$

$- 4 = 12x$

$12x = - 4$

$x = - 4 \div 12$

$x = - \frac{1}{3}$

Перевiрка:

$- 4 \div ( - \frac{1}{3} ) = 12$

$- 4 \times ( - 3) = 12$

$12 = 12$

$12 - 12 = 0$

$0 = 0$

$6)x \div ( - 4) = - 12$

$x = - 12 \times ( - 4)$

$x = 48$

Перевiрка:

$48 \div ( - 4) = - 12$

$- 12 = - 12$

$- 12 + 12 = 0$

$0 = 0$

$7)0.5x = - 0.3$

$x = - 0.3 \div 0.5$

$x = - \frac{3}{5}$

Перевiрка:

$0.5 \times ( - \frac{3}{5} ) = - 0.3$

$- \frac{1.5}{5} = - 0.3$

$- 0.3 = - 0.3$

$- 0.3 + 0.3 = 0$

$0 = 0$

$9)12(x + 5) = - 24$

$12x + 60 = - 24$

$12x = - 24 - 60$

$12x = - 84$

$x = - 84 \div 12$

$x = - 7$

Перевiрка:

$12( - 7 + 5) = - 24$

$12 \times ( - 2) = - 24$

$- 24 = - 24$

$- 24 + 24 = 0$

$0 = 0$

$10)3(6 - x) - 2(x - 5) = 63$

$18 - 3x - 2x + 10 = 63$

$- 5x + 28 = 63$

$- 5x = 63 - 28$

$- 5x = 35$

$x = 35 \div ( - 5)$

$x = - 7$

Перевiрка:

$3(6 - ( - 7)) - 2( - 7 - 5) = 63$

$3(6 - ( - 7)) - 2( - 7 - 5) = 63$

$3 \times 13 - 2 \times ( - 12) = 63$

$39 + 24 = 63$

$63 = 63$

$63 - 63 = 0$

$0 = 0$

$11)0.6(2y - 11) = 0.4(y - 7) - 74.8$

$1.2y - 6.6 = 0.4y - 2.8 - 7.48$

$1.2y - 0.4y = - 2.8 - 7.48 + 6.6$

$0.8y = - 3.68$

$y = - 3.68 \div 0.8$

$y = - 4.6$

Перевiрка:

$0.6(2 \times ( - 4.6) - 11) = 0.4( - 4.6 - 7) - 7.48$

$0.6( - 9.2 - 11) = 0.4 \times ( - 11.6) - 7.48$

$0.6 \times ( - 20.2) = 0.4 \times ( - 11.6) - 7.48$

$- 12.12 = - 12.12$

$- 12.2 + 12.2 = 0$

$0 = 0$