It is known that the image of y = f (x) is composed of two rays and a part of parabola in the figure below. The analytic expression of the function is obtained I didn't learn it well

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1. (this is the article. Good points are added.) 1. What are the main features of the main part of the article? Can the order of several levels of this part be exchanged? What are the reasons? 2. What are the characteristics of the overall conception of the article? 3. Talk about the main function of the sentence at the end of the article 4. At present, China is strengthening the construction of new countryside, to gradually realize the urbanization of rural areas, so the author expresses his love for the rural areas in the south of the Yangtze River and the contradiction between strengthening the construction of new countryside? Please tell me your views and reasons
2. Given the arithmetic sequence [an], Sn = [(an + 1) / 2] ^ 2, find the general term formula of an N is subscript, the result of my own calculation is extremely troublesome.
3. Given two points a and B on the number axis, the distance between points a and B is 1, and the distance between point a and origin 0 is 3, then the number corresponding to point B is______ ．
4. The following sets are represented by the method of Property Description: (1) the set composed of even numbers; (2) the set composed of odd numbers; (3) A set of all natural numbers divided by 3 and 2; (4) A set of all trapezoidal bodies; (5) A set of rhombic collectives; (6) A set of squares Urgent, tomorrow
5. A batch of goods is transported by several vehicles with a load of 8 tons. If each vehicle is loaded with 5 tons, there will be 10 tons left. If each vehicle is loaded with 8 tons, the last one will not be empty. How many vehicles are there in total I think it's either four or five I'm not sure Let me know the general steps
6. Three trucks carry a total of 480 cases. According to this calculation, how many cases can be transported by adding two more trucks?
7. If the length ratio of the two diagonals of the diamond is 1:3, the degree of the smaller inner angle of the diamond is 0______ Degree
8. If the diagonals of the diamond are 8 and 8, then the inner angles of the diamond are 3-----
9. It is known that the ratio of the degrees of the two adjacent corners of the diamond is 1:2 and the perimeter is 16 cm. What is its area
10. If the perimeter of the diamond is 16cm and the degree ratio of two adjacent angles is 1:2, the area of the diamond is () A. 43cm2B. 83cm2C. 163cm2D. 203cm2
11. Is the unit conversion between emergency currents a specific number or a scientific counting method
12. ^What symbol does it stand for
13. How to calculate AC power I now have a voltage of 90a at 400 / 3 / 50. What is the power? This is AC, not DC How to calculate the single-phase 220 V?
14. What is 45 horsepower
15. How do physical units EV and j convert? RT
16. Experimental principle of side resistance of voltmeter and ammeter
17. If R1 and R2 are connected in series to the same power supply, the power of R2 is P2. Then P1: P2 =?
18. 1. A "pz220-100" bulb, connected to a 200V circuit, the rated power of this bulb is______ W what is the actual power__________ W 2. An incandescent lamp is marked with the word "pz220-40". If the lamp is turned on for 4 hours every day, the power consumption will be 30 days per month____________ Kilowatt hour 3. 1 kwh of electricity can supply a 500W electric iron to work normally________ hour
19. In the space quadrilateral ABCD, e, F, G, h are the midpoint of AB, BC, CD, Da respectively. If AC ⊥ BD, efgh is what graph
20. In space quadrilateral ABCD, e, F, G and H are the midpoint of AB, BC, CD and Da respectively. If AC is perpendicular to BC, it is proved that efgh is a rectangle