/kaoyan/%E6%95%B0%E5%AD%A6/%E9%AB%98%E7%AD%89%E6%95%B0%E5%AD%A6/%E7%AC%AC2%E7%AB%A0%20%E5%AF%BC%E6%95%B0/%E7%9F%A5%E8%AF%86%E7%82%B9/2.2%20%E5%8F%AF%E5%AF%BC%E6%80%A7%E7%9A%84%E5%88%A4%E6%96%AD/ to /kaoyan/math/advanced-math/ch02-dao-shu/knowledge/2.2-ke-dao-xing-de-pan-duan