並前往https://math.ymhs.tyc.edu.tw/masterchen/chenjt99/ScrClass/1112/%E9%AB%98%E4%B8%89%E7%94%B2%E4%B8%8B%E7%BF%92%E9%A1%8C/Ch%202-1%20%E5%BE%AE%E5%88%86%E7%9A%84%E6%A6%82%E5%BF%B5%E8%88%87%E6%80%A7%E8%B3%AA(%E7%BF%92%E9%A1%8C).pdf
