What is the information retrieval language, what kinds of retrieval languages are there, and points out the five major categories of CLC

In order to make the retrieval process, that is, the comparison of document identification and information questioning go smoothly, both of them need to be expressed in a certain language. Only with the help of this language, can the indexing personnel and retrieval personnel have a common agreement and communicate with each other

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1. 88…… 8×99…… 9 clever calculation 88…… 8×99…… nine 2001 82001 9 Please calculate as follows:= = =
2. How many meters is 1000 mm
3. English translation Text translation of Unit1 in module3!
4. What is the greatest common factor of 28 and 42______ ．
5. 256 times 9 minus 46 times 9 simple calculation
6. I want to ask 56.25 inches is equal to how many centimeters? Is it 143? When I work, I always have the conversion between inch and centimeter. The integer is 0.50.75, so I don't know how to calculate it. By the way, how many inches is 143 cm I'm very dissatisfied with your answer. I hope experts can guide me!
7. How many hectares is 0.6 square kilometers?
8. How many hectares is 5 / 8 square meter?
9. How many hectares is 8.07 square kilometers equal to
10. Three eighths of a hectare equals () square meters
11. A rectangular piece of land, the ratio of length and width is 8:5, length is 24 meters more than width. How many square meters is the area of this land?
12. Decompose 20.75.111.123 into prime factors,
13. A cuboid container, 30 cm in length, 15 cm in width and 8 cm in height. Pour the water into a cuboid container with 20 cm in edge length, What's the depth of the water? There is 4cm deep water in the cuboid container
14. A = 2 × 2 × 3 × 7, B = 2 × 2 × 2 × 7, the greatest common divisor of a and B is______ The least common multiple is______ ．
15. The king is always lucky
16. My mother said to me: "you go to school by yourself tomorrow"
17. If a times b equals 260, then a times 2B equals several, 3A times b equals several, a times (b divided by 2) = several (a divided by 4) * (b * 4)=
18. 4 / 5 * 3.5 + 5.5 * 80% + 0.8 simple operation
19. Simple operation of 3.5 * 0.8 + 5.5 * 80% + 4 / 5
20. (1) 45 × 3.5 + 5.5 × 80% + 0.8 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; (2) 1116 + 813 - (1116-813) (3) 13 △ 23-25) × 35