一﹣5/6÷﹙﹣19/6﹚÷[1/24×﹙﹣5/4﹚]－0.25÷1/4
=-5/6×(-6/19)÷(-5/96)-1
=5/19×(-96/5)-1
=-96/19-1
=-115/19
二﹣3－[﹣5＋﹙1－0.2÷3/5﹚÷﹙﹣2﹚]
=-3-[-5+(1-1/3)÷(-2)]
=-3+5+2/3÷(-2)
=2-4/3
=2/3
三﹛8/3－[﹙1.5×8/3﹚÷1/6－8/7]﹜÷8/3
=[8/3-(3/2×8/3÷1/6)-8/7]÷8/3
=(8/3-4×6-8/7)÷8/3
=1-9-3/7
=-8-3/7
=-59/7