Question

СРОЧНО ПОТРІБНІ РОЗВЯЗКІ ДО КІНЦЯ!

Answer 1

Ответ:

7

$a)15x = - 0.45 \\ 15x \div 15 = - 0.45 \div 15 \\ x = 0.45 \div 15 \\ x = - 0.03$

$b) 5y - 33 = - (2y - 9) + 7 \\ 5y - 33 = - 2y + 9 + 7 \\ 5y - 33 = - 2y + 16 \\ 5y + 2y = 16 + 33 \\ 7y = 49 \\ y = 49 \div 7 \\ y = 7$

$2)7.5x + 150 = 0 \\ 7.5x = - 150 \\ x = - 150 \div 7.5 \\ x = - 20$

$4)5 \times (3y - 6) - 4 \times (y + 24) = 0 \\ 15y - 30 - 4y - 96 = 0 \\ 11y - 126 = 0 \\ 11y = 126 \\ y = \frac{126}{11} \\ y = 11\frac{5}{11}$

$5)19 - (5x + 2) = 14 \\ 19 - 5x - 2 = 14 \\ 17 - 5x = 14 \\ - 5x = 14 - 17 \\ - 5x = - 3 \\ x = \frac{3}{5} \\ x= 0.6$

6)

$\frac{5x - 3}{2} + \frac{2x + 4}{5} = 8 \\ 5(5x - 3) + 2(2x + 4) = 80 \\ 25x - 15 + 4x + 8 = 80 \\ 29x - 7 = 80 \\ 29x = 80 + 7 \\ 29x = 87 \\ x = 87 \div 29 \\ x = 3$