Today,most of the world's soybeans go to feed not just chickens, but cows,pigs and even fish.
VOA: standard.2010.02.01
You could say, I could have zero chickens and 20 pigs, does that work? I've got one chicken and nineteen pigs, does that work?
为什么简单列举出所有可能的情况,再一个来检验?你可能会说,我可以有0只鸡和20只猪,这能行吗?
And the question is, so how many pigs does he have, and how many chickens does he have? Wow. What a deep problem, right? But you're going to see why we're going to use this in a second. So you know how to solve this, this is a fifth-grade problem, right?
为了避免歧义,这些猪和鸡都是健全的,现在问题是它到底有多少只猪和鸡呢?,多深刻的一个问题啊,对吗?,但是你将要看到的是,我们为什么要举这个例子,你知道如何解答这个问题?
And for sake of argument, there are no amputees among the chickens and the pigs.
它走到农地里然后它看到了,20个头和56只脚。
System of linear equations. What are the equations here? Well, I could say, you know, the number of pigs plus the number of 20 chickens equals 20, right? Because we've got 20 heads. And then what else do I have?
如何解决这个问题呢?,用线性方程式的办法来解决,等式是什么呢?你应该知道,猪的数量加鸡的数量等于,对吧?因为我们有20个头?
I've got two chickens and eighteen pigs, you get the idea.
我有1只鸡和19只猪,这能行吗?,我有2只鸡和18只猪。
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