1:
7/12 1/12 12/35 2/35
13/36 5/36 17/72 1/72
2:
79/90 23/42 4/9 23/40
3:
+ - -
- + +
4: 1/2+x=5/6
x=5/6-1/2
x=1/3
x+1/4=1/2
x=1/2-1/4
x=1/4
x-2/3=1/4
x=2/3+1/4
x=11/12
5: 3/7-1/3=2/21
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