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b) 3/4 + 7/12 - 5/9 = (27 + 21 - 20)/36 = 28/36 = 7/9
c) 3/5 + 1/4 - 7/10 = (12 + 5 - 14)/20 = 3/20
d) 5/6 - 1/3 + 3/8 - 5/24 = (20 - 8 + 9 - 5)/24 = 16/24 = 2/3
20+6-15 11
............... =..........
30 30
3/4 +7/12- 5/9
27+21- 20 28
.................. = .......
36 36
3/5 +1/4 -7/10=
12+5-14 3
............... = .......
20 20
5/6- 1/3 +3/8- 5/24
20-8+9-5 16
................ = ..............................
24 24