13 7 13*2 + 7*3 26+21 47 11
1)--- + ---- = -------------- = --------- = ---- = 1----
18 12 36 36 36 36
5 3 5*5 - 3*7 25-21 4
2)-- - -- = ----------- = -------- = ----
7 5 35 35 35
5 3 1 5*4 - 3*3 - 1*2 20-3-2 15 5
3)-- - -- - --- = ------------------- = --------- = ----(сокращаем на 3) = --
6 8 12 24 24 24 8