141.-3/4-7/8=-6/8-7/8=-13/8
2.-13/8-11/6=-39/24-44/24=-83/24
3.-83/24-7/12=-83/24-14/24=-97/24
4.-97/24-1/2=-97/24-12/24=-109/24
5.-109/24*3.7=-109/24*3 7/10=-109/24*37/10=-4033/240=-16 193/240
или так
-3/4-7/8-11/6-7/12-1/2=-18/24-21/24-44/24-14/24-12/24=-(18+21+44+14+12)/24=-109/24=-4 13/24
-109/24*3.7=-16 193/240