17.75-6.25-﹙﹣8.5﹚﹢﹙﹣0.75﹚-22.25 = 17.75-6.25﹢8.5-0.75-22.25 =﹙11.5+8.5﹚-﹙0.75﹢22.25﹚ = 20-23 = ﹣3 如满意,求采纳!!!
55.75