2целых 2/3:2+(4/15+2/5):(3целых1/3*3/5)

2 2/3:2+(4/15+2/5):(3 1/3*3/5)=1 2/3
1)4/15+2/5=4/15+6/15=10/15
2)10/3*3/5=2
3)10/15*2/1=5/15=1/3
4)8/3*1/2=4/3
5)4/3+1/3=5/3=1 2/3

8/3:2+(4/15+2/5):(10/3*3/5)=
4/15+2/5=4/15+6/15=10/15=2/3
10/3*3/5=2
8/3:2=8/3*1/2=4/3
2/3:2=2/3*1/2=1/3
4/3+1/3=5/3=1целая2/3