Question

очень нужно проверить ответы!

• 7х/6 - 5х/18 = 4/27

• |2х + 1| + 13 = 14

• ||х| - 2| = 2

• |х| - 4х = 9

• 2(х - 5) - 6|х| = -18

Answer 1

$1) \frac{7x}6 - \frac{5x}{18} = \frac4{27}\\\frac{4x}9 = \frac4{9*3}\\x = \frac13\\2) |2x + 1| = 1\\1. 2x + 1 = 1; x = 0\\2. 2x + 1 = -1; x= -1\\x = 0; x= -1\\3)||x|-2| = 2\\1. |x| - 2 = 2\\|x| = 4\\x = 4; x = -4\\2.|x| - 2 = -2\\|x| = 0; x = 0\\x = -4; x= 0; x= 4\\\\4) |x| = 9 + 4x\\1. x = 9 + 4x; x = -3\\x = -9 - 4x; x = -\frac95\\x = -3; x = -\frac95\\5)6|x| = 2x + 8\\|x| = \frac{x+4}3\\1. x= \frac{x+4}3; x= 2\\x = \frac{-x-4}3; x= -1\\x = -1; x= 2$