Question

Решите уравнение
а) 7x - 21 = 0
б) 10х + 36 = 0
в) 8 - х = 0
г) 15 - 3х = 0
д) 9х - 1 = 17
е) -3х + 22 = 19
ж) 7 - 2х = 8
з) -12 - 0.3х = 9​

Answer 1

Ответ:

$7x - 21 = 0 \\ 7x = 21 \\ x = 3$

$10x + 36 = 0 \\ 10x = - 36 \\ x = - 3.6$

$8 - x = 0 \\ 8 = x$

$15 - 3x = 0 \\ 15 = 3x \\ x = 5$

$9x - 1 = 17 \\ 9x = 18 \\ x = 2$

$- 3x + 22 = 19 \\ - 3x = 19 - 22 \\ - 3x = - 3 \\ x = 1$

$7 - 2x = 8 \\ - 2x = 8 - 7 \\ - 2x = 1 \\ x = - 0.5$

$- 12 - 0.3x = 9 \\ - 0.3x = 9 + 12 \\ - 0.3x = 21 \\ x = - 0.7$