(5/14+10/21)*3 3/5 +1 1/6:(13/22-25/33)=

1)5/14+10/21=5/6 2)5/6×33/5=5,5 3)13/22-25/33=-1/6 4)1 1/6:(-1/6)=7/6:(-1/6)=7 5)5,5+7=12,5