Question

пожалуйста,помогите
18,19,20

Answer 1

18. |y - 1.7| = 4
|y|= 4 + 1.7 = 5.7
y = 5.7
19. |x+7|=0
|x|=0 - 7= - 7
x = 7
20. |3x - 5| = 0
|3x| = 0 + 5 = 5
|x|= 5/3 = 1 2/3
x = 1 2/3(дробь)