並前往https://math.ymhs.tyc.edu.tw/chenjt99/ScrClass/1042/HomWok/Book2/%E7%BF%92%E4%BD%9C%E7%94%B24-1%20%E4%B8%80%E7%B6%AD%E6%95%B8%E6%93%9A%E5%88%86%E6%9E%90.pdf
