5/3×2/9+1/2×7/9=10/27+7/18=41/54
Ответ:
15/6×4/9=60/54=30/27=10/9
10/9+2 1/4=40/36+29/36= 2 69/36
69/36×4/9=69/36×16/36=1104/1296
-3+n,