The speed of light in vacuum is about 299792458 M / s, which can be expressed as______ M / S (keep three significant digits)

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• 1. Using scientific notation: 700000
• 2. Use scientific notation! one point two four zero zero zero two zero zero zero two point eight zero zero zero one zero zero 3.0.0000000801 4.0.0000521 5.0.10001
• 3. In order to encourage residents to save water, a city charges tap water users according to the following standards: If the monthly water consumption of each household does not exceed a ton, it will be calculated as m yuan per ton; if the monthly water consumption exceeds a ton, the excess will be calculated as 2m yuan per ton?
• 4. In order to encourage residents to save water, a city charges tap water users according to the following standards: if the monthly water consumption of each household is not more than 12 tons, the charge is a yuan per ton; if the monthly water consumption is more than 12 tons, the charge is 2A yuan per ton; if the monthly water consumption of a household is 20A yuan, the actual water consumption of the resident in this month______ Tons
• 5. In order to encourage residents to save water, a city charges tap water users according to the following standards: if the monthly water consumption of each household does not exceed 12 tons, 1.8 yuan per ton will be charged; if the monthly water consumption exceeds 12 tons, 3.6 yuan per ton will be charged for the excess part; if the monthly water consumption of a household is 50.4 yuan, how many tons of water does the household share
• 6. 1000 words on saving water Write for yourself
• 7. Experience of saving water To junior high school sound level, not too much
• 8. In November last year, northern primary schools saved 4.35 tons of water in the first half of last year, and 4.95 tons in the second half of last year. How many tons of water were saved per day on average?
• 9. A primary school plans to use 250 tons of water this year, saving 30 tons of water compared with last year. What percentage of last year's water use is the planned water use this year? How to write what is the percentage of what?
• 10. The significance of water saving It's better to be concise. It's better not to be lengthy!
• 11. 3000000m, expressed by scientific counting method as (keep two significant numbers)
• 12. -0.00002006 scientific counting method
• 13. -0.0000025 is expressed by scientific notation as______ ．
• 14. What is 0.00001 scientific counting method?
• 15. Choose five different numbers from the nine numbers 1-9 to form a five digit number. It is required that they can be divided by 3, 5, 7 and 11. What is the minimum speed!
• 16. Use 1, 2 and 3 to form a four digit number. If each number appears at least once, then the probability that such four digit number can be divided by 3
• 17. The sum of each digit of a three digit number is 17. The ten digit number is larger than the one digit number. 1. If the hundred digit number of the three digit number is swapped with the one digit number to get a new three digit number, the new three digit number is 198 larger than the original three digit number
• 18. The sum of each digit of a three digit number is 17. The ten digit number is larger than the one digit number. 1. If the hundred digit number of the three digit number is swapped with the one digit number to get a new three digit number, the new three digit number is 198 larger than the original three digit number
• 19. There is a three digit number, the number of one digit is 2 times of the number of hundred digits, and the number of ten digits is 1 larger than the number of hundred digits. If the new number obtained by transposing the number of digits with the order of hundred digits (changing the number of digits into hundred digits) is 49 less than 2 times of the original number, the original number can be calculated
• 20. There is a three digit number, the sum of which is 16. The ten digit number is the sum of one digit number and one hundred digit number, So the new number is 594 larger than this number. How about the three digit number