2 3/11*7/9+6 8/11:1 2/7-1 1/8
1) 2 3 /11 × 7/9 = 175/99 2) 6 8/11 : 1 2/7 = 518/99 3) 175/99 + 518/99 = 693/99 =7 4) 7 - 1 1/8 = 5 7/8