Question

Упростите выражение: |3d|-||d+s|+2d|-|s| если d <s <0

Answer 1

|3d|=-3d
|d+s|=-d-s
||d+s|+2d|=|-d-s+2d|=|d-s|=s-d
|s|=-s
|3d|-||d+s|+2d|-|s|=-3d-(s-d)-(-s)=-3d-s+d+s=-2d
Проверка
d=-3 s=-2
9-|5-6|-2=6