女儿和儿子还小的时候，我给他们买过很多乐高积木，他们长大了以后渐渐都不玩儿了。妈妈把积木收拾到车库里准备扔掉，我觉得很可惜，毕竟是从小带着记忆长大的东西，而且我也很喜欢玩。想来想去还是把所有的积木拼成一整块，既节省地方，又看上去是个有意思的东西。说干就干，忙了一个下，用所有的乐高积木拼了一个前所未有的高塔，而且里边是空心的，把所有没法拼塔用的东西都放进去了。拼好以后，儿子觉得很棒，要求放在他的卧室，真是太好啦。
Category Archives: Yetao
三角形三条中线相交于一点
最近在辅导Yetao数学, 顺便温习了一下初等几何中如何证明三角形的三条中线相交于一点。自己以前没有学过这个证明，过程还挺有意思的，列在下边。 三角形ABC，假定D为BC的中点。E为AC的中点，BE和AD相交于点G。现在通过CG做一条直线，与AB相交于F。我们只要证明F是AB的中点，那么就可以证明三角形的三条中线相交于一点。假定我们用符号 S(ABC) 表示三角形 ABC 的面积，那么我们有： 因为BD等于CD S(BDA) = S(CDA) S(BDG) = S(CDG) 因为 S(BDA) = S(BDG) + S(BAG)， S(CDA) = S(CDG) + S(CAG) 综合234，所以 S(BAG) = S(CAG) 按照同样的思路，我们可以得到 S(BAG) = S(BCG) 综合五和六，所以 S(BCG) = S(CAG) 下来，我们假定 很明显我们有 因为 考虑到上面的等式7，代入前面各项，我们有： 求解得到: …
Yetao的新球拍
Yetao最近喜欢上打乒乓球，开始用正胶，可能是觉得击打比较舒服，后来看我和本的反胶球拍击球威力很大，就也想换个反胶。我手头只有一块 Hadraw SK 贴着快两年旧的 Tenergy 05-FX，拍子有点重，而且胶皮也老了，就给她换了一个 Joola X-Plode Sensitive，也是以击打为主。粘的时候旧板子除胶可真是费了一番功夫！ 拍子粘好了： Hadraw SK + 2 * X-Plode Sensitive = 182 克 我的拍子：Timo Boll ZLF + 2 * Evolution MX-S （软胶面，硬海绵）= 192 克 Ben的拍子：Timo Boll Allround + 2 * Sapphira = 161 克 看来Ben的拍子还是最轻呀。
Father’s Day Cards
Card from Yetao Card From Ben
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Yeti Math Bloggie 34: Alina’s Cookies :P
Yo peeps, Yeti here! As a lover of cookies 😛 I shall put a math related cookie problem in this post, because I merely feel like it. We start with the problem itself: When Alina was hungry she ate c cookies, which was 30% of all the cookies she had. How many cookies did she have in …
Yeti Math Bloggie 32: Fraction Calculations
The denominator of a certain fraction was 147 greater than its numerator. What was the denominator of this fraction, if after the fraction was reduced it became ? We can assume the numerator is , then the denominator is , and we have the following equation: (1) The following steps solve the equation: (2) …
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Yeti Math Bloggie 32: Solving Inequalities
Yo peeps! Yeti here, explaining the steps of inequality solving. We shall start by examining the following problem: (1) Our first step would be to make the expression equal to 5. We can then get the following equation: (2) After solving, we can get that the . But if you remember, the original …
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Yeti Math Bloggie 31: Distance, Speed and Time
Yo peeps, Yeti here, explaining the topic of speed, distance and time. Now, Yeti here is on a very tight schedule here and so this post shall be very short and basic. So, lets start with relationships. (1) (2) (3) Now, we shall present you with a problem and guide you through …
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Yeti Math Bloggie 28: The Wonders of Absolute Value Explained
So first, Yeti must say zat absolute value is pretty easy to learn! I, Yeti shall also explain how they can be used in equations and other helpful stuffs. Lets start by reviewing the definition shall we? Absolute value: How far away is a # on a number line from zero Now, if you do …
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