Question

1 ) 4 2/7 * 1 13/15 - 2 1/13 * 1 4/9 =
2) 2.4 * 1 5/12 * 17/17 - 3 1/7 =
3) 39 5/7 * 3 15/37 -2 5/7 * 3 15/37 =
4) 2 5/9 * 1 13/28 + 4 4/9 * 1 13/28 =
25 баллов