∵ 丨x - 4丨与 2丨y + 3丨互为相反数
∴丨x - 4丨+ 2丨y + 3丨= 0
∵丨x - 4丨≥ 0 ,2丨y + 3丨≥ 0
∴ x - 4 = 0
y + 3 = 0
∴ x = 4 ,y = - 3
∴ 丨(2 x - 2)y丨
=丨(2 × 4 - 2)× (- 3)丨
=丨(8 - 2)× (- 3)丨
=丨6 × (- 3)丨
= 丨- 18丨
= 18
∵ 丨x - 4丨与 2丨y + 3丨互为相反数
∴丨x - 4丨+ 2丨y + 3丨= 0
∵丨x - 4丨≥ 0 ,2丨y + 3丨≥ 0
∴ x - 4 = 0
y + 3 = 0
∴ x = 4 ,y = - 3
∴ 丨(2 x - 2)y丨
=丨(2 × 4 - 2)× (- 3)丨
=丨(8 - 2)× (- 3)丨
=丨6 × (- 3)丨
= 丨- 18丨
= 18