1. 72又36分之1除以36又72分之1
2. 108又36分之1除以36又108分之1
72又36分之1除以36又72分之1
= (72*36+1)/36 ÷ (36*72+1)/72
= (72*36+1)/36 * 72/(36*72+1)
=72/36
=2
2题同理