20: (6 целых 3/14 + 1 целая 11/14) - 4 целых 1/4 - 2 целых 3/4 :5 =
1) 6.3/14+1.11/14=8 2)20:8=20/8=2.4/8=2.1/2 3)2.3/4:5=11/4*1/5=11/20 4)2.1/2-4.1/4=-1.3/4 5)-1.3/4-11/20=-1.15/20-11/20=-1.26/20=-1.13/10=-2.3/10