並前往http://math.prhs.ptc.edu.tw/earth/%E5%9C%B0%E7%90%83%E7%A7%91%E5%AD%B8%E5%90%8D%E8%A9%9E%E9%87%8D%E9%BB%9E%E6%95%B4%E7%90%86.doc