The set {(0,3), (3,0), (1,2,), (2,1)} is represented by description

｛（x,y）lx+y=3,x,y≥0｝

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1. Representation of set {2,4,6,8} by description Little brother, just on the road, not many points So {x | x = 2,4,6,8} right? Which is right? I feel right
2. One half square meter = () square decimeter, three tenths of a ton = () kilogram, three fourths of a hour = () minute, four fifths of a second = () 10 × 7 / 15=
3. 100 square decimeter: 1 square meter. 2 tons: 250 kg reduction ratio
4. Simplification ratio: 4 / 5 kg: 30 g, 5 cm: 0.1 M, 1 / 3 h: 0.3 M2: 750 M2
5. Simplification ratio: 5 square meters to 50 square decimeters
6. The square of half B is reduced to
7. Known samples x1, X2 If the variance of XN is 2, then the sample is 3x1 + 2, 3x2 + 2 The variance of 3XN + 2 is______ ．
8. Data x1, X2 If the average of XN is 5 and the variance is 2, then 3XL + 2, 3x2 + 2 The average of 3XN + 2 is______ The variance is______ ．
9. A set of data x1, X2 The average of XN is 90, the variance is 13.5, then 3x1-80, 3x2-80 The average of 3xn-80 is______ The variance is______ ．
10. Given a set of data x1, X2 The variance of x 10 is s ^ 2 = 6, find another set of data 1 / 3x1,1 / 3x2 What is the variance of 1 / 3x10? That's x, subscript 1, and so on
11. The set {1,1 ／ 2,1 ／ 3,1 ／ 4} is represented by the description method, and {1,1 ／ 2,1 ／ 3,1 ／ 4} represents the fractional line, Can it be written as {x │ (x-1) (x-1 / 2) (x-1 / 3) (x-1 / 4)} Please say why,
12. The set 1 / 2,2 / 3,3 / 4,4 / 5 is represented by description,
13. The set {1,1 / 2,1 / 3,1 / 4} is represented by description,
14. Split term method (- 1000 and 2 / 3) - 999 and 5 / 6 - (- 2000 and 3 / 4) - 1 and 1 / 2
15. Negative two and a half times negative three and a third times negative one equals zero
16. Minus one times one half = minus one plus one half, and what you find is this rule
17. Minus one times one half equals minus one plus one half. Why? It's due tomorrow!
18. There is a series of numbers: one-half, one-half, two-thirds, one-third, two-thirds, three-thirds. According to this law, what is the number of the third column
19. What are their rules? What are the last two?
20. One in half, one in three, three in two, two in nine... Rule