﹣3-[﹣5+(1-0.2×3/4﹚×﹙﹣25/22﹚]
= ﹣3-[﹣5+17/20x（﹣25/22﹚]
= ﹣3-[﹣5+（﹣85/88﹚]
= ﹣3-（﹣5又85/88﹚
= ﹣3+5又85/88
= 2又85/88