8/10-5/6=(24-15)/30=9/30=3/10=0,3
1/50+1 цел37/100=1/50+137/100=(2+137)/100=139/100=1,39
-(711/100+1/2)=-((711+50)/100)=-761/100=-7,61
2/3-8/10=(20-24)/10=-0,4
-2/7*14/10=-28/70=-0,4
-24/100*(-3/160)=72/16000=0,0045
42/10:(-6/7)=-42*7/10*6=-294/60=-4,9
16/100:12/5=16*5/100*12=80/1200=8/120=2/30
16/5:64/100=1600/(5*64)=1600/320=5