一辆自行车骑了100里， 问轮胎上一点移动多少距离？ 注意不是位移
要用微积分的吧。
Near 100 li.
It May be near 200 li. (r/R)*100+100
I,m wrong,007 win
near (400/Pi)*li, You are right.
Agree with your answer
Thanks, I did not know that word before
少于100里，因为自行车
因为自行车要刹车 ;)
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2010-05-26 13:14:25要用微积分的吧。