So, it's zero versus some huge negative number.

所以 就是零与一个很大的负数相比。

If the result is a negative number, you're going to have to cut back on your spending.

如果结果是负数，你就得削减开支了。

The system, the exchange where this trading happens, it had to be changed to allow negative numbers.

这个系统，即进行交易的交易所，必须做出改变以允许负数。

For example, for a long time, there was no such thing as taking the square root of negative numbers.

例如，长期以来，负数是不能取平方根的。

Well actually, you want a negative number.

实际上，你想要一个负数。

So we need a way to represent positive and negative numbers.

所以我们需要一种方法来表示正数和负数。

When we hit zero, or a negative number, we knew that we we're done.

当我们达到零或负数时，我们知道我们完成了。

Adding a negative number moves you in the negative direction.

添加负数会使您朝负方向移动。

After that, positive numbers indicating upward motion, and negative numbers indicating downward motion.

之后 正数表示向上运动 负数表示向下运动。

Cady Heron and The Plastics. Things get interesting when we add positive and negative numbers together.

卡迪·赫伦和塑料制品。当我们将正数和负数相加时，事情会变得有趣。

But what if we try to imagine a concept such as the square root of negative number?

但是如果我们试着想象一个概念，比如负数的平方根呢？

But since we are multiplying an inequality by a negative number you have to swap the inequality sign.

但是由于我们将不等式乘以负数，因此您必须交换不等号。

He was supposed to plan their family budget while their family income had already passed zero and was now approaching negative numbers.

他应该在他们的家庭收入已经超过零 现在接近负数的时候为他们计划家庭预算。

Positive 1, plus negative 2, is negative 1. And what happens if we add negative numbers together?

正数1加上负数2就是负数1。如果我们把负数加在一起会发生什么？

Add a negative number, move in a negative direction.

添加一个负数，向负方向移动。

Check it out, It's our Burn Book. We put all the rules of adding negative numbers, and put them in here.

看看吧，这是我们的烧录书。我们把所有负数相加的规则，都放在这里。

Remember, positive numbers move you in the positive direction and negative numbers move you in the negative direction.

请记住，正数使您朝正方向移动，负数使您朝负方向移动。

Addition is always commutative, whether you're adding positive or negative numbers If you swap them around, you get the same answer.

加法总是可交换的，无论你添加正数还是负数如果你交换它们，你会得到相同的答案。

And since doubling a negative number still gives you a negative number, walking the three blocks to the south wall means the city owes you eight.

由于将负数加倍仍然会得到负数，所以步行三个街区到南墙意味着这座城市欠你八个。

That's it for this week. If you wanna play around with adding positive or negative numbers stick around for the quiz. Awesome!

这就是本周的内容。如果您想尝试添加正数或负数，请继续参加测验。惊人的！