→ aether982:我是算 2π( |b| - |a| ) 61.228.78.229 07/14
→ aether982:總覺很奇怪 好像要討論... 61.228.78.229 07/14
推 inzaghi0221:其實 2拍(b-a)就好了....因為b>a 218.172.251.34 07/14
推 aether982:重點是 答案對嗎? 220.136.69.228 07/14
推 RogerClemens:答案沒錯 61.229.172.101 07/14
→ inzaghi0221:取絕對值就會錯 218.169.196.210 07/14
推 youyouyou:我跟樓上的看法一樣.... 61.229.64.224 07/17