並前往https://math.ymhs.tyc.edu.tw/masterchen/chenyan/TeaPlan108/Contns/1092/%E9%AB%98%E4%B8%80%E4%B8%8BH/109%E4%B8%8B%E9%AB%98%E4%B8%80(ch%204.4%E6%A9%9F%E7%8E%87)(%E4%B8%8A%E8%AA%B2).pdf
