First remove the brackets, and then merge the similar terms x + [x + (- 2x-4y)], half (a + 4b) - one third (3a-6b),

First remove the brackets, and then merge the similar terms x + [x + (- 2x-4y)], half (a + 4b) - one third (3a-6b),

First: - 4Y
Second: - 3A + 24B

X + (2x-1) - (x / 3 + 3) process

The original formula = x + 2x-1-x / 3-3 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; = 3x-x / 3-4 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; = [(8x)

There is a column of numbers A1, A2, A3, A4, a5. Starting from the second number, each number is equal to the difference between 1 and the reciprocal of the previous number. If A1 = 2, then a2007 = a.2007 B
2 C.1/2 D.-1

A1 = 2, the reciprocal is 2 / 1
a2=1-2/1=2/1
a3=1-2=-1
a4=1-（-1）=2
a5=1-2/1=2/1
Three in one cycle
2007 △ 3 = 669, just divisible
a2007=-1
So choose D

14x / 16y = 7:20, X / y = 2:1

Cross multiplication
280x=112y
x/y=112/280

In the plane rectangular coordinate system, the set a = {(x, y) │ y = x} represents the straight line y = x
In the plane rectangular coordinate system, the set a = {(x, y) │ y = x} represents the straight line y = X. from this point of view, the relationship between the set B = {(x, y) │ {2x-y = 1, x + 4Y = 5} and the set a and B is?

2X-Y=1
X+4Y=5
3X+3Y=6
Y = - x + 2 and y = x intersect at the origin, and the two lines are perpendicular
The two sets do not contain each other

If a ^ 2-6a + m is a complete square, find the value of M

With the method of collocation, M = 9

It is known that the three vertices of △ ABC are a (5,3), B (7, - 1), C (- 1), the high line on BC side of linear equation (1), the median line (3) of AC side (2)
C（-1，5）

BC slope = (5 + 1) / (- 1-7) = - 3 / 4
So high slope = 4 / 3
Higher than a
So Y-3 = 4 / 3 (X-5)
3y-9=4x-20
4x-3y-11=0
AB midpoint (6,1), BC midpoint (3,2)
So the median of AC is (Y-1) / (2-1) = (X-6) / (3-6)
-3*(y-1)=x-6
x+3y-9=0
BC midpoint D (3,2)
A(5,3)
So (Y-2) / (3-2) = (x-3) / (5-3)
2y-4=x-3
x-2y+1=0

Which is bigger in 2012 than 2013?
Which is bigger, the power of N + 1 or the power of N + 1?

2012^2013-2013^2012
=(2012^2012*2012-2013^2012)>0
That is 2012 ^ 2013 > 2013 ^ 2012

If the specification of electric energy meter is "220 V 10 (20) a", is the maximum electric power of allowable load of electric energy meter 2200 w or 4400 w?

It can be greater than 20A. We have learned it. This means that the maximum current of an electrical appliance is 20A at a certain stage, but it is not permanent. So it should be 4400w. Since the current has a maximum limit, so should the electric power

It is known that the set u = R and the set a = {x | x2-16

Set a = {x | x2-16