Anyway, this is all just to say that the change in potential energy is negative F times the change in position.

负F(力小)乘以位置变化量有负号是因为 如果你让这个力直推着你。

Well I will now magically separate the negative sign from the 4. 1, 2, abracadabra.

好吧，我现在神奇地把负号从4上。、二、变。

So that just alternating series with plus and minus signs as the coefficient.

因此这只是以正负号交替级数作为系数。

So I'll just put a negative up there.

所以我就在这个负号。

And then finally we have plus minus.

然后最后我们有正负号。

Now, square root usually has a plus or minus sign when you take it.

现在，当你取平方根时，通常有个正负号。

You have to have that positive mindset that there is always something out there and it is a hard one to have when you have zero dollars and the negative sign in your bank account.

你必须保持积极心态，相信总有机在等待着你，而当你银行账户里钱都没有，还挂着负号时，这种心态确实难以维持。

Now, if you want to calculate the magnifying power of the telescope, just start with the same equation you used for the magnifying lens, but with a negative sign, because the image is flipped.

现在，如果你想计算望远镜倍率，就从镜使用同个公式始， 但要加上负号， 因为图像被翻转了。

So plus X times the negative expected value of Y. So I'll just say minus X times the expected value of Y. And that negative sign comes from this negative sign right over here.

所以加上X乘以Y负期望值。我直接说减去X乘以Y期望值。这个负号就来自这里这个负号。

First off, the convention in the context of Fourier transforms is to think about rotating in the clockwise direction, so let's go ahead and throw a negative sign up into that exponent.

首先， 在傅里叶变换上下文中， 我们习惯于考虑顺时针旋转，所以我们先把个负号进指数里。

Geometrically, the meaning of this function is that for any input vector X-Y-Z, you consider the parallelopyped defined by this vector, V and W, then you return its volume with a plus or minus sign, depending on orientation.

几何上 这个函数意义是 对于任何输入向量X-Y-Z 你考虑由这个向量V和W定义平行体 然后你返回它体积 根据方向带正号或负号。

This value – the charge of a single electron in Coulombs – is known as the elementary charge, and it's denoted with a lowercase " e" .

个负号。这个值，值 个电子电荷，以库仑为单位，你知道。

And I don't like that negative sign in the mean.

我不喜欢均值里负号。

Similar feeling to the way perhaps Dirac had felt about this positron, plus or minus.

类似地，或许狄拉克对正电子感觉也是如此，正负号不确定。

Well, one way to think about what signs are is as directions; positive means pointing right along a number line, and negative means pointing left along that number line.

好吧，思考符号种方式是将其视为方向；正号意味着在数轴上向右指，负号则意味着在数轴上向左指。

If you ignore the negative signs for a minute these are the exact same numbers arranged in the same pattern as in the main triangle.

如果您暂时忽略负号，这些数字就是按照与主三角形相同模式排列完全相同数字。

Now it is negative 1 time 4. With multiplication you can detach and reattach positive or negative signs from the number.

现在是负1乘以4。在乘法中，你可以从数字上离或重新附加上正号或负号。

Which means that the induced emf in a coil of wire is equal to the number of coils, times the change in magnetic flux over the change in time, all multiplied by a negative sign.

这意味着线圈中感应电动势为 等于线圈数乘以磁通量随时间变化变化，全部乘以负号。

See any circles with two negative signs?

看到有任何两个负号圆圈吗？