Let the image of F (x) be a parabola, and when the point (x, y) moves arbitrarily on the image of F (x), the point (x, Y2 + 1) moves on the image of the function g (x) = f [f (x)], the expression of G (x) is obtained

Let the image of F (x) be a parabola, and when the point (x, y) moves arbitrarily on the image of F (x), the point (x, Y2 + 1) moves on the image of the function g (x) = f [f (x)], the expression of G (x) is obtained

It can be seen from the meaning of the title that Y2 + 1 = g (x)  f [f (x)] = f (y),  f (x) = x2 + 1,  g (x) = f [f (x)] = f (x2 + 1) = X4 + 2x2 + 2

Given that the function f (x) is an odd number defined on R, when x > = 0, f (x) = x (1 + x) draws the image of function f (x)

When x is greater than or equal to 0, f (x) = x (1 + x)
When x is less than 0, - x > 0, f (- x) = - x (1-x)
And the function f (x) is an odd function defined on R
So f (- x) = - f (x)
So f (x) = - f (- x) = x (1-x) x < 0
The image is made up of half of two quadratic functions

If the image of function f (x) is a line segment and its end coordinates are (- 2,4) and (4, - 5), what is the analytic expression and what is the domain of the function

F (x) = - 3 / 2x + 1, the domain is [- 2,4]

The image of a known function consists of two rays and a parabola (including the endpoint) with an opening downward. As shown in the figure, try to find the analytic expression of the function

What about the picture

What does power cable zr-yjv-1kv 3 * 150 + 1 * 95 mean

Zr means flame retardant!
YJV is a cross-linked polyethylene insulation
1 is the voltage level
3 × 150 is a three core with a cross section of 120mm2
1 * 95 is the cross-section of ground wire 95mm2

What is the section of power cable zr-yjv-0.6/1kv-3 × 120?
Core area

120 mm2!
Zr means flame retardant!
YJV is a cross-linked polyethylene insulation
0.6/1 is the voltage level
3 × 120 is a three core with a cross section of 120mm2!

What kind of cable is zr-yjv-0.6 / 1-5 * 10? It should be explained in detail

Zr: flame retardant type
YJV: PVC insulated cable
0.6/1: withstand voltage range 0.6kv-1kv
5 * 10: 5-core cable, the cross-sectional area of each conductor is 10mm ^ 2

Insulation resistance 500VDC 100m Ω min
And insulation strength 500V AC 1min

Insulation resistance 500VDC 100m Ω min
When the insulation resistance is measured at 500V DC for one minute, the resistance value must be ≥ 100mohm
Insulation strength 500V AC 1min
Insulation strength test, at 500V AC for 1 minute

What is the meaning and classification of insulation resistance?

That is, the DC resistance of the insulation under the specified conditions. I haven't heard of grading. I don't know where you have heard of grading
I guess what you heard is how much m Ω the insulation resistance of basic insulation should be greater than and how much m Ω the insulation resistance of reinforced insulation should be greater than. There are also definitions of basic insulation and reinforced insulation in Baidu Encyclopedia

Who knows to explain the concept of insulation resistance and electrical strength and the relationship between them?

Insulation resistance generally has a certain value, which can be measured by insulation resistance meter. (insulation resistance meter is also called megohmmeter, the voltage value of megohmmeter will also affect the measured value). Is electrical strength electrical insulation strength? Electrical insulation strength is generally measured according to relevant national standards