並前往https://math.ymhs.tyc.edu.tw/chenjt99/ScrClass/1052/%E9%AB%98%E4%BA%8C/%E9%AB%98%E4%BA%8C%E7%BF%92%E9%A1%8C/ch1%E7%B6%9C%E5%90%88%E6%BC%94%E7%B7%B4.pdf
