1) Считаем снизу вверх:
1-1/2=1/2
1/(1/2)=1•2=2
2+2=4
3-3/4=2 1/4 = 9/4
9:(9/4)=9•4/9=4
4+4=8
6/8=3/4
2)
2-3/4=1 1/4=5/4
1:(5/4)=1•4/5=4/5
4-4/5=3 1/5=16/5
4:(16/5)=4•5/16=1 1/4
6-1 1/4=4 3/4=19/4
19:(19/4=19•4/19=4
1/4
3)
4+4/5= 4 4/5
8:(4 4/5)=8:(24/5)=5/3=1 2/3
5+1 2/3=6 2/3=20/3
5/(20/3)=5•3/20=3/4
6+3/4=6 3/4
9:(6 3/4)=9•4/27=4/3=1 1/3
7+1 1/3=8 1/3=25/3
5: (25/3)=5•3/25=3/5