並前往https://math.ymhs.tyc.edu.tw/masterchen/chenjt99/ScrClass/1111/%E9%AB%98%E4%B8%89%E7%B7%B4%E7%BF%92%E5%8D%B7/10%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B8.pdf