[(4+4/7)÷(2+1/2—1+9/11)—(9+1/3)×5/21]×(1+3/4) =[32/7÷(5/2-20/11)-28/3*5/21]×7/4 =[8÷(55/22-40/22)-20/9*7/4] =8÷15/22-35/9 =176/15-35/9 =883/135 =6+73/135