並前往http://www.ltyschool.edu.hk/pdf/suspension/maths/5%E6%95%B8_%E7%AC%AC12%E8%AA%B2_%E5%88%86%E6%95%B8%E4%B9%98%E6%B3%95%E6%87%89%E7%94%A8%E9%A1%8C_%E5%B7%A5%E4%BD%9C%E7%B4%99.pdf
