只有两道：
(3/8＋8/2)＋5/8
=(3/8＋5/8)＋8/2
=1＋4
=5
2/5＋77/76-77/76-1
=2/5＋(77/76-77/76)-1
=2/5＋0-1
=2/5-1
=-3/5再整点悬赏更高