有理数abc,b小于a小于0小于c小于2,化简（[]等于绝对值符号）[a-b]-[b-2]-[a-c]-[2-c]

因为 b < a < 0 < c < 2所以 |a - b| = a - b|b - 2| = 2 - b|a - c| = c - a |2 - c| = 2 - c所以 |a - b| - |b - 2| - |a - c| - |2 - c| =a - b - 2 + b- c + a - 2 + c =2a - 4