2 1/5 – 1 5/7 =

2 1/5 – 1 5/7

(5×2+1) – (7×1+5)

11/5 – 12/7

11×7/5×7 – 12×5/7×5

77/35 – 60/35

17/35

2 6/8 + 5 1/2

(8×2+6) + (2×5+1)

22/8 + 11/2

22×2/8×2 + 11×8/2×8

44/16 + 88/16

132÷4/16÷4

33/4

2 3/4 + 2 1/2 – 2 1/4

(4×2+3) + (2×2+1) – (4×2+1)

11/4 + 5/2 – 9/4

11×2×4/4×2×4 + 5×4×4/2×4×4 – 9×2×4/4×2×4

88/32 + 80/32 – 72/32

96÷8/32÷8

12÷4/4÷4

3/1

6 1/3 + 1 3/4 – 5 1/2

(3×6+1) + (4×1+3) – (2×5+1)

19/3 + 7/4 – 11/2

19×4×2/3×4×2 + 7×3×2/4×3×2 – 11×4×3/2×4×3

152/24 + 42/24 – 132/24

62÷2/24÷2

31/12