2-4/11÷44/55-1/6
＝2-4/11×55/44-1/6
＝2-4/11×5/4-1/6
＝2-5/11-1/6
＝91/66＝1又25/66
4/5×4/7+1/5÷7/4
＝4/5×4/7+1/5×4/7
＝（4/5+1/5）×4/7
＝1×4/7
＝4/7
4÷4/9-4/9÷4
＝4×9/4-4/9×1/4
＝9-1/9
＝8又8/9