3/4+5/6 ×7/12-4/24; (3 7/5 +2/30) ×3 3/7 - 1 1/2

3/4 +5/6*7/12-4/24=3/4+35/72-4/24=54/72+35/72-12/72=77/72=1 5/72(3 7/5+2/30)*3 3/7-1 1/2=(22/5+2/30)*24/7-3/2=(132/30+2/30)*24/7+3/2=134/30*24/7-3/2=136/35-3/2=272/70-105/70=167/70=2 27/70