Li-Fan Chen says to YSITD http://www.ceec.edu.tw/PaperForResearch/107ResearchPaper/02-1-107%E7%A0%94%E7%A9%B6%E7%94%A8%E8%A9%A6%E5%8D%B7-%E5%9C%8B%E5%AF%AB(%E4%B8%80).pdf 第二題好難ㄛ 怕