有趣的数学【07】：牢记公式，这是数学的倚天剑
《倚天屠龙记》里面有一句话：
武林至尊，宝刀屠龙，号令天下，莫敢不从，倚天不出，谁与争锋。
意思是屠龙刀是至高无上的宝贝利器，在江湖中战无不胜独领风骚，只要倚天剑不出现，就没什么对手。
在数学中，也有类似的对照。
一个人可能很聪明，对数字有天赋，任何复杂的运算都能依靠自己大脑的算力解决，堪比电脑。不过，这种天赋不加培养引导，很有可能就是野路子。
还有一种方法，就是普通人经过训练，掌握住一些公式规律，那么他解题可能也并不比天赋高的人慢。
天赋是数学世界的屠龙宝刀，而公式，堪比数学世界的倚天剑。
下面我们来看看倚天剑的厉害：
还是老规矩，先不要急着解题，分析一下题面。
如果你对数学公式都记得很牢的话，会从这道题想到，数学里有一个三项立方和公式，表达式是这样的：
而一旦想到了这个三项立方和公式，那么，面对这道题就相当于你拿到了倚天剑，什么妖魔鬼怪来了都不在话下，一剑定乾坤。
以下就是利用倚天剑的完整解题步骤，根本不用打草稿，一步步把步骤写出来，答案自己就跃然纸上了：
我又要说了，这个做题和做人是一样的，都有基本准则。
掌握了基本准则，就相当于混江湖的古惑仔拿到了倚天剑，做题就容易，做人也轻松。
数学的倚天剑，是公式；而做人的倚天剑，是真善美。
Posted from my blog with SteemPress : https://kissfirer.000webhostapp.com/maths07
Congratulations @kissfirer! You have completed the following achievement on the Steem blockchain and have been rewarded with new badge(s) :
Click here to view your Board
If you no longer want to receive notifications, reply to this comment with the word
STOPTo support your work, I also upvoted your post!
Do not miss the last post from @steemitboard:
Congratulations! This post has been upvoted from the communal account, @minnowsupport, by kissfirer from the Minnow Support Project. It's a witness project run by aggroed, ausbitbank, teamsteem, someguy123, neoxian, followbtcnews, and netuoso. The goal is to help Steemit grow by supporting Minnows. Please find us at the Peace, Abundance, and Liberty Network (PALnet) Discord Channel. It's a completely public and open space to all members of the Steemit community who voluntarily choose to be there.
If you would like to delegate to the Minnow Support Project you can do so by clicking on the following links: 50SP, 100SP, 250SP, 500SP, 1000SP, 5000SP.
Be sure to leave at least 50SP undelegated on your account.
吃了吗？你好！家中可愛的寵物照想要跟大家分享嗎？或是出去玩拍到一些可愛的動物，別忘了到@dpet分享，可以得到@dpet的獎勵喔！倘若你想让我隐形，请回复“取消”。
勘误：《笑傲江湖》应为《倚天屠龙记》
对的，现在就改，多谢！
This post has been voted on by the SteemSTEM curation team and voting trail in collaboration with @curie.
If you appreciate the work we are doing then consider voting both projects for witness by selecting stem.witness and curie!
For additional information please join us on the SteemSTEM discord and to get to know the rest of the community!