помогите решить, пожалуйста примеры с дробями:
2/9*27/28 =
1/3+1/5 =
1/2+1/7 =
5/6-3/4 =
2/3-4/7 =
3/10+1/2 =
9/20+3/4 =
15 1/2-2 3/8 =
10 3/4-5 5/8 =
5 5/6+6 1/6 =
2 1/3*1 1/2 =
1 1/5*2 1/2 =
7 2/9+4 =
14 5/8-1/8 =
7-15/18 =
4-3/11 =
2 1/3-1/2 =
4 1/7-1/5 =
3 1/4+4 1/5 =
2 1/3+5 1/2 =