Question

67-23,1112-56,712-38,914-1935

Answer 1

6/7-2/3=18/21-14/21=4/21

11/12-5/6=11/12-10/12=1/12

7/12-3/8=14/24-9/24=5/24

9/14-19/35=45/70-38/70=7/70=1/10

Answer 2

6/7 -2/3=(6×3-2×7)/21=(18-14)/21=4/21
11/12-5/6=(11-2×5)/12=1/12
7/12-3/8=(7×2-3×3)/24=(14-9)/24=5/24
9/14-19/35=(9×5-19×2)/70=(45-38)/70=
=7/70=1/10