並前往https://math.ymhs.tyc.edu.tw/masterchen/chenyan/TeaPlan107/TeaPnCon/106SB3/CH1/Ch1.3%E5%A4%9A%E9%A0%85%E5%BC%8F%E7%9A%84%E4%B9%98%E9%99%A4%E9%81%8B%E7%AE%97(%E4%B8%8A%E8%AA%B2).pdf