What is the Chinese meaning of CCTV

China Central Television

1. Three kinds of wired communication media commonly used in computer network are___ 、 _ 、 _ The abbreviation of LAN is___ ,

1. Twisted pair coaxial cable optical fiber
2、LAN =Local Area Network
3.VLAN = Virtual Local Area Network

As shown in Figure 1, in the plane rectangular coordinate system xoy, the line y = x + 6 intersects the X axis at a, intersects the Y axis at B, BC ⊥ AB intersects the X axis at C
① Calculate the area of △ ABC. ② as shown in Figure 2, D is a moving point on the OA extension line, and BD is the right angle side to make an isosceles right triangle BDE to connect EA. Find the analytical formula of straight line EA. ③ point E is a point on the positive half axis of Y axis, and ∠ OAE = 30 ° AF bisects ∠ OAE, point m is the moving point on ray AF, and point n is the moving point on line Ao. Try to judge whether there are such points m and N, so as to minimize the value of OM + nm? If it exists, please write the minimum value and explain it

① Find the area of △ ABC = 36; ② make ef ⊥ X-axis at F through e, extend EA intersection Y-axis at h. ∵ △ BDE is isosceles right triangle ∵ de = dB, ∵ BDE = 90 °∵ BDE = 90 °∵ EDF + ∵ BDO = 90 °∵ BOD = 90 °∵ BDO + ∵ dbo = 90 °∵ EDF = ∵ dbo (the remaining angles of the same angle are equal) ∵ EF ⊥ x-axis ∵

Solution equation: 3Y & # 178; - (2Y + 1) (Y-2) = (Y-5) (y + 1)

3y²-(2y+1)(y-2)=(y-5)(y+1)
3y²-2y²+3y+2=y²-4y-5
7y=-7
y=-1

Given the circle x ^ 2 + y ^ 2 = 16, make a straight line through the point (5,0) to intersect the circle at two points, and find the trajectory equation of the midpoint of the line between the two points

Let L: y = K (X-5), take this formula into the circle equation: x2 + [K (X-5)] 2 = 16, and simplify to (K2 + 1) x2-10k2x + 25k2-16 = 0, then we can know X1 + x2 =... K. similarly, we can know Y1 + y2 =... K, then we can know the relationship between the midpoint x0, Y0 and K, and we can eliminate K simultaneously

In the solution of the bivariate linear equation 4x + 5Y = 9, if x and y are opposite to each other, then the solution of the equation is?

X=-9 Y=9

A point trajectory with a constant sum of distances to two fixed points is an ellipse
The following proposition is true
A. The locus of a point whose sum of distances to two fixed points is constant is an ellipse
B. The locus of a point whose ratio of distance to fixed line and fixed point F (C, 0) is an ellipse
C. The locus of the point whose distance ratio to the fixed point F (- C, 0) and the fixed line is (a > C > 0) is the left half ellipse
D. The locus of a point whose distance ratio between a fixed line and a fixed point F (C, 0) is (a > C > 0) is an ellipse
Can you explain it in detail

A is wrong. The constant needs to be greater than the distance between two points
B. The input of C and D is not clear,
You can refer to the second definition of ellipse below
(1) If the ratio of the distance to the point F (C, 0) and the distance to the fixed line x = A & # / C is constant C / a (a > C > 0), the locus of the point is ellipse;
(2) If the ratio of the distance to the point F (- C, 0) and the distance to the fixed line x = - A & # / C is constant C / a (a > C > 0), the locus of the point is ellipse;

Can all quadratic equations of one variable be solved by three methods: collocation method, formula method and factorization method?

Theoretically, it's OK, but in fact, sometimes it's difficult to decompose factors and sometimes it's troublesome to formulate formulas. It's necessary to decide which method to use according to the given data (ABC, the value of constant term)

How long will December 27, 2011 be before June 13, 2012

169 days

7. Give it a swing
Rearrange the following 6 badminton balls. 3 for each volleyball, and line them up in 3 rows,
Then draw your line
Tip: you can find 6 pieces or stones instead of badminton
This is a question in the basic training of primary school mathematics curriculum published by Hunan Education Press
I think and think, still can't do it, I don't know if my brain short circuit temporarily

What is the Chinese meaning of CCTV