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高中课本的隐藏彩蛋!准高三必看

  • 2026-06-10 05:47:29
高中课本的隐藏彩蛋!准高三必看
我是源哥。
你有没有这种感觉:每次考完试,看到答案里有一个你从没见过的公式,心里一万个问号?
这玩意儿课本上有吗?
我告诉你,真有。而且就在你的数学课本里,光明正大地印着。只不过它藏得太隐蔽了,你翻书的时候直接略过了,老师有时候也来不及讲。
我管这些叫课本里的“隐藏彩蛋”。今天我给你挖几个,你看看眼不眼熟。

第一个彩蛋:糖水不等式

光听名字你就知道它有多接地气。你在家冲糖水,糖越多越甜。数学上怎么表达?如果a克糖水里有b克糖,甜度是b/a。你再往里面加m克糖,甜度变成(b+m)/(a+m)。哪个更甜?肯定是后面那个。所以(b+m)/(a+m) > b/a。
就这么一个生活常识,高考居然考过。而且它还能用来秒杀一类比大小的问题。你吭哧吭哧做半天,别人用糖水不等式一步到位。你说气不气?

第二个彩蛋:容斥原理

这名字听着挺唬人,其实就是“多退少补”的道理。两个集合的并集,先加A再加B,但A和B重叠的部分加了两次,所以要减掉一次。三个集合更复杂一点,但逻辑一样。
这东西课本上有,但通常放在阅读材料或者小字部分。结果呢?高考概率题、计数题里经常用到。你不知道容斥原理,就得老老实实分类讨论,一不小心就漏了或者重了。

第三个彩蛋:函数的凹凸性

课本上有一张图,画了一个曲线,标了“上凸”和“下凸”。很多同学一眼扫过,觉得不就是弯的方向不一样嘛。但凹凸性在导数大题里是个大杀器。比如证明某个不等式,你直接构造函数,利用凹凸性就能判断最值在哪。你没学过,就只能硬算。

第四个彩蛋:泰勒公式

对,你没看错,泰勒公式。当然不是让你背那个无穷级数,而是它的“一阶版本”
当x很接近0的时候,sinx≈x,e^x≈1+x,ln(1+x)≈x。这叫“近似公式”,课本上有小字介绍。结果呢?高考选填压轴题里,经常出现让你比较几个数的大小,你用近似公式一换,答案立马出来。别人还在构造函数求导呢,你已经写完了。

第五个彩蛋:不等式的几何证明

很多不等式,课本上给了个几何图形,然后说“由图可知”。比如基本不等式的半圆弦长图,柯西不等式的向量图。这些图不是摆设,它是让你理解不等式本质的钥匙。你记住了图,不等式就变成了“一看就知道”的事。
你发现没有?这些彩蛋有一个共同特点:
它们不是考试大纲里的“核心考点”,老师不会专门花两节课讲。但它们就像是出题人留给细心学生的“小妙招”!
你发现了,做题就跟开了挂一样。
所以我把课本里这些藏得深的、考试又爱考的“彩蛋”,全部扒了出来,整理成了一份资料。一共十几个,每个都配了课本原位置、通俗解释、高考真题怎么用。
这份资料,我不想叫它“秘籍”或者“宝典”,太土了。
我叫它《高中数学教材隐藏重要公式总结》。

这份资料现在免费送给各位家长和同学。

领资料前,把规矩说清楚

以下两条,你接受再往下看:

第一,这篇文章右下角点个“推荐”,评论区扣个【彩蛋】

第二,点击👇卡片进主页,点私信加我小助理发送【彩蛋】领资料。

都是独家版权,加小助理才能领取。注意,小助理不是机器人,是个活人。只欢迎有礼貌的人添加。

小助理每日回复数量多,添加后请主动说明来意!

源哥还有体系化针对新高考的数学课程,有需要的也欢迎咨询小助理。

我源哥什么水平,不需要在这里多说。你要是之前看过我发的文章,就知道每一篇都配有独家资料和详细讲解。

点击👇看看

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  1. CONNECT:[ UseTime:0.001109s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001672s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000844s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001546s ]
  6. SELECT * FROM `set` [ RunTime:0.003773s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001898s ]
  8. SELECT * FROM `article` WHERE `id` = 468738 LIMIT 1 [ RunTime:0.003534s ]
  9. UPDATE `article` SET `lasttime` = 1781044620 WHERE `id` = 468738 [ RunTime:0.015720s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001982s ]
  11. SELECT * FROM `article` WHERE `id` < 468738 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008334s ]
  12. SELECT * FROM `article` WHERE `id` > 468738 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001156s ]
  13. SELECT * FROM `article` WHERE `id` < 468738 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015087s ]
  14. SELECT * FROM `article` WHERE `id` < 468738 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008682s ]
  15. SELECT * FROM `article` WHERE `id` < 468738 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006834s ]
0.178325s