1/2 ÷ 4/5 ÷ (2/9 × 3/8 )=1/2*5/4除以1/12=5/2*12=30
(5/6 - 3/4) ÷ 5/12 ÷ 9/5=1/12*12/5*5/9=1/9
3/7 ÷ [5/7 - (3/7 + 1/5) =3/7除以(5/7-22/35)=3/7除以3/35=5
1/2 ÷ 4/5 ÷ (2/9 × 3/8 )=1/2*5/4除以1/12=5/2*12=30
(5/6 - 3/4) ÷ 5/12 ÷ 9/5=1/12*12/5*5/9=1/9
3/7 ÷ [5/7 - (3/7 + 1/5) =3/7除以(5/7-22/35)=3/7除以3/35=5