Split term method (- 1000 and 2 / 3) - 999 and 5 / 6 - (- 2000 and 3 / 4) - 1 and 1 / 2

RELATED INFORMATIONS

• 1. The set {1,1 / 2,1 / 3,1 / 4} is represented by description,
• 2. The set 1 / 2,2 / 3,3 / 4,4 / 5 is represented by description,
• 3. 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,
• 4. The set {(0,3), (3,0), (1,2,), (2,1)} is represented by description
• 5. 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
• 6. 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=
• 7. 100 square decimeter: 1 square meter. 2 tons: 250 kg reduction ratio
• 8. Simplification ratio: 4 / 5 kg: 30 g, 5 cm: 0.1 M, 1 / 3 h: 0.3 M2: 750 M2
• 9. Simplification ratio: 5 square meters to 50 square decimeters
• 10. The square of half B is reduced to
• 11. Negative two and a half times negative three and a third times negative one equals zero
• 12. Minus one times one half = minus one plus one half, and what you find is this rule
• 13. Minus one times one half equals minus one plus one half. Why? It's due tomorrow!
• 14. 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
• 15. What are their rules? What are the last two?
• 16. One in half, one in three, three in two, two in nine... Rule
• 17. For dimming bulbs, Xiao Ming thinks that when the lamp is dark, it saves more power than when it is on, but Xiao Lin thinks that when the lamp is dark, the power of sliding rheostat increases, so it doesn't save power. Q: who is right? Briefly describe your reasons (Baidu has many different answers, Dashen must do it by himself!)
• 18. What is the process of dehydrohalogenation
• 19. What do you mean by this idiom
• 20. What's the meaning of set description? How to explain his concept? Why to express it like this? {xix-3 > 2} what does each letter mean? I really don't know how to express in this way whether certain objects belong to certain conditions, what are certain conditions, and where are certain objects?