If f (x) satisfies f (x) + F (2a-x) = 2B for any X in the domain, then the image of function y = f (x) is symmetric with respect to point (a, b) If f (x) satisfies f (x) + F (2a-x) = 2B for any X in the domain, then the image of function y = f (x) is symmetric with respect to point (a, b). (1) the function f (x) is known

If f (x) satisfies f (x) + F (2a-x) = 2B for any X in the domain, then the image of function y = f (x) is symmetric with respect to point (a, b) If f (x) satisfies f (x) + F (2a-x) = 2B for any X in the domain, then the image of function y = f (x) is symmetric with respect to point (a, b). (1) the function f (x) is known

What are you asking!
If f (x) satisfies f (x) + F (2a-x) = 2B for any X in the domain of definition, here is a conclusion: x + (2a-x) = 2A, f () + F () = 2B, the image of function y = f (x) is symmetric with respect to point (a, b)

The solution of X / 1 * 2 + X / 2 * 3 +. + X / 2004 * 2005

(X-X/2)+(X/2-X/3)+.+(X/2004-X/2005)=X-X/2005=2004
X=2005

4xy （x-y）-（y-x）³

4xy （x-y）-（y-x）³
=4xy （x-y）+（x-y）³
=(x-y)[4xy+(x-y)²]
=(x-y)(x+y)²
Hope to help you

What is the area of arable land in the world?
A5.1KM B1.49 KMC0.148KM

B1.49 K

1. The charged ball a with a mass of 0.2g is hoisted with silk thread. If the ball B with a charge of 4 × 10-8 times is close to it, when the distance between the two balls is 3cm at the same height, the angle between the silk thread and the vertical is 45 degrees. At this time, the Coulomb force F on the ball B is =? And the electric quantity QA of the ball a is?
2. There are two identical charged balls a and B. they are charged with 10q and - Q respectively, and the distance between the centers of the balls is R. fix them with insulating pillars. First, use the third same metal ball C to repeatedly contact a and B in turn. Finally, remove C, how many times of the original force between a and B?
There are also two small questions. 3. To ask whether the Coulomb force of two point charges is actually the Coulomb force between them? Similar to the first question in the first question
4. For two charged bodies, one with positive charge and the other with negative charge, is the amount of charge separated after contact directly added and divided by two? Or is the amount of charge separated after absolute value added and divided by two?

1. From 45 degrees, f = g = 0.002n
Take F with Coulomb's law to calculate the electric quantity!
2. The power of the last three small demands must be average. They are all 3Q. Then you can calculate the output
3. The Coulomb force between them?
This kind of statement is not standard, which shows that a kind of force has to say three elements
4. It's a direct addition divided by 2, but it doesn't need to add absolute value. If it's negative, it's a negative charge

What day is the weather on January 31, 2013

On Thursday, which city are you in? The weather varies from - 4 ℃ ~ 1 ℃ overcast to cloudy. The north wind is 3-4. Langfang, January 31

The first six digits of the regular expression must be numbers, and the total length of the following Chinese characters is less than 60 characters

Total length less than 60
^\d{6}[\w\d\u4e00-\u9fa5]{1,54}$
The length of the back part is less than 60
^\d{6}[\w\d\u4e00-\u9fa5]{1,60}$

Bottom plus bottom times height divided by two
In addition to calculating the area of trapezoid, can we also calculate the area of other quadrilateral? Or can we calculate the area of all quadrilateral? If there are only some, which can also use this formula to calculate the area

I'm glad to be able to answer for you
This formula is applied to any quadrilateral with at least one pair of parallel sides
Add up the two parallel sides (that is, the top and bottom) and multiply the distance between the two parallel sides (that is, the height) by 2, which is the formula you said

Senior high school mathematics ～～～～～～～～～～～～
m. If n belongs to {x | x = 100a2 + 10A1 + A0}, where AI (I = 0,1,2) belongs to {1,2,3,4,5,6}, and M + n = 606, then the number of different points in the plane is?

Let's analyze the relationship between 606 and M + n
Let m = 100m2 + 10m1 + M0, n = 100n2 + 10n1 + N0
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M0 + N0 must be equal to 6
Therefore, there are five situations (1 + 5,2 + 4,3 + 3,4 + 2,5 + 1) in position 0
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M1 and N1 must be 4 + 6 or 6 + 4 (in order to make bit 1 zero, note that there is a carry here)
Therefore, there are two situations (4 + 6 or 6 + 4) in position 1
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M2 + N2 must be 5 (6 after receiving carry of bit 1)
Therefore, there are four situations (1 + 4,2 + 3,3 + 2,4 + 1) in position 2
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According to the multiplication principle, 5 × 2 × 4 = 40
A very interesting question
The key is to be able to analyze the situation of each individual
Late at night random analysis, I do not know whether to do it right
Please point out the shortcomings
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Personal opinions are for reference only

In the equal ratio sequence [an], a1 + an = 66, Sn = 126, A2 multiplied by an-1 = 128, find n and Q

A2 multiplied by an-1 = 128 = A1 × an, and because a1 + an = 66, we can get A1 = 2, an = 64 or A1 = 64, an = 2
Sn's formula can open A1 anq = 126-126q, and take the two cases in