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

而且我不喜欢这个负号。

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

因此这只是以正负号交替的级作为系。

See any circles with two negative signs?

看到任何带有两个负号的圆圈吗？

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

负的F(力的大小)乘以位置变化量有负号是因为 如果让这个力一直推。

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

吧，我现在地负号与 4. 1, 2, abracadabra 分开。

If they don't, draw a plus on the three unmarked coins if they're heavier or a minus if they're lighter.

如果他们不这样做， 则在三枚未标记的硬币上画一个加号， 如果它们更重，或者如果它们更轻， 则画一个负号。

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

现在它是负 1 乘以 4。通过乘法，您可以从字中分离并重新附加正号或负号。

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，这些字就是按照与主三角形相同的模式排列的完全相同的字。

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

一个负号。这个值，值 一个电子的电荷，以库仑为单位，知道。

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 的负预期值。所以我只说负 X 乘以 Y 的预期值。负号来自这里的负号。

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，如果想计算望远镜的放大倍率，只需从用于放大镜的相同方程开始， 但要加上一个负号， 因为图像是翻转的。

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.

这意味线圈中的感应电动势为 等于线圈乘以磁通量随时间变化的变化，全部乘以负号。

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 这个函的意义是 对于任何输入向量X-Y-Z 考虑由这个向量V和W定义的平行体 然后返回它的体积 根据方向带正号或负号。