If the square of a-2a-1 = 0 and the square of b-2b-1 = 0, then a-b=

If the square of a-2a-1 = 0 and the square of b-2b-1 = 0, then a-b=

0, ± 2 times root sign 2

General division 1 / x ^ 2-4 and X / 4-2x

x²-4=(x+2)(x-2)
4-2x=-2(x-2)
The simplest common denominator of denominators (X & # 178; - 4) and (4-2x) is 2 (x + 2) (X-2)
1/(x²-4)=1/[(x+2)(x-2)
=2/[2(x+2)(x-2)]
x/(4-2x)=x/[-2(x-2)]
=-x/[2(x-2)]
= -[x(x+2)]/[2(x+2)(x-2)]

There is a column of numbers A1, A2, A3,... An. Starting from the second number, each number is equal to the difference between 1 and the reciprocal of the number in front of it. If A1 = 2, then A2009 is ()

A1 = 2, A2 = 1 / 2, A3 = - 1, A4 = 2, A5 = 1 / 2, A6 = - 1 / 2... The cycle goes on, so A2009 = 1 / 2

X equals 3698 minus 0.14x, how much is x equal to

x=3698-0.14x
Transfer available
x+0.14x=3698
14x = 3698
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In the plane rectangular coordinate system, the set C = {(x, y) y = x} represents the straight line y = X. from this angle, what does the set D = {(x, y) 2x − y = 1x + 4Y = 5} represent? What is the relationship between sets C and D?

The set D represents the intersection of the line 2x-y = 1 and the line x + 4Y = 5. By solving the equations 2x − y = 1x + 4Y = 5, we get x = 1, y = 1; that is, d = {(1,1)}, obviously (1,1) on the line y = x, ■ (1,1) ∈ C, ■ D ⊆ C

If 16 (a-b) ^ 2 + 25 + m is a complete square, then the value of M may be?
There should be specific steps

16 (a-b) square + m + 25
=[4(a-b)]^2+2*4(a-b)*5+25
=(4a-4b+5)^2
therefore
M=40*(a-b)
Another is m = - 40 (a-b)

As shown in the figure, De is the median line of △ ABC, M is the midpoint of De, and the extension line of CM intersects AB at point n, then s △ DMN: s quadrilateral anme equals ()
A. 1：5B. 1：4C. 2：5D. 2：7

∫ De is the median line of △ ABC, ∥ de ∥ BC, de = 12bc. If the area of △ ABC is 1, according to de ∥ BC, ∥ s ∥ ade = 14, am is connected. According to the title, s ∥ ADM = 12S ∥ ade = 18S ∥ ABC = 18, ∥ de ∥ BC, DM = 14bc, ∥ DN = 14bn, ∥ DN = 13bd = 13ad. ∥ s

The third power of 3 + the second power of 3 + +3+1

Original form
=1+3+…… +3^2012+3^2013
=(1-3^2004)/(1-3)
=(3^2004 -1)/2

How to calculate the maximum power of the electric appliance allowed to be installed in the electric energy meter
What is the maximum power of the electric appliance allowed to be installed on the watt hour meter with the word "220V 15A"?
It's better to explain the formula

220X15=3300w

It is known that M is an integer (about X, y). The system of equations 4x-3y = 66x + my = 26 has an integer solution
Remember, it's a system of equations

4x-3y = 6 (1) 6x + my = 26 (2) (2) X2 - (1) X3: (2m + 9) y = 34, y = 34 / (2m + 9) substituting (1) x = (3m + 39) / (2m + 9) equation has integer solution, so x and y are integers, so m = 4