如果题目是：3/4 ÷ 9 × 4/3
3/4 ÷ 9 × 4/3
= (3/4× 4/3 ) ÷ 9
= 1÷9
= 1/9
如果题目是：3/4 ÷ ( 9 × 4/3)
3/4 ÷ 9 ÷ 4/3
= 3/4 × 1/9 × 3/4
= 1/16