1) (2 2/7+1 1/7)*1 1/6= 2) (1 2/3+2 4/9): (2 26/27-2 2/9)=

1)
(2 2/7+1 1/7)*1 1/6 = 3 3/7 * 1 1/6 = 24/7 * 7/6 = 24/6 = 4,

2)
(1 2/3+2 4/9) : (2 26/27- 2 2/9) = (1 6/9+2 4/9) : (2 26/27-2 6/27) = 4 1/9 : 20/27 = 37/9 * 27/20 = 111/20 = 5 11/20