代數式的 HCF 及 LCM 都是近年文憑試的熱門題目，而答對的百分率都只得50-60%。考生們如果尚未掌握相關技巧，就不要錯過今次的內容。
學校沒有教的數學網址:
https://mathseasy.hk
Facebook: https://www.facebook.com/MathsEasy/
ED Music:
Light Sting by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100433
Artist: http://incompetech.com/
