10/4 - 13/4-3/4
7/5 - 1/5+6/5
10/6 - 2/3×5/2
4/5 - 12/5-8/5
7/10 - 3/10+4/10
9/6 - 4/6+5/6
15/12 - 3/4×5/3
2 - 3/2÷3/4
7 - 7/5÷1/5