好晕好晕，中午啊joe发左条甘的题目过来，好像初中学过，完全唔记得，据说还是美国的高考题，哈哈，挠破头都仲系有d想唔通，comx那猪头还画了分解图。。。
题目：有两个圆，大圆半径是小圆半径的3倍。请问，小圆贴着（外贴）大圆的边，绕大圆滚完一圈，小圆转了几圈？
如果是内贴的话答案又是多少？
答案是4 和 2 ，大概思路就是圆心的运行轨迹，再转化为直线就明显了，但是总是有d地方觉得想不通的，何必，何必呢
flash分解图：
comx猪画的图：
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