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Using scientific notation: 700000
7*10^7
It should be calculated by scientific notation
1. If the average person needs 0.5kg of grain per day, how many kg of grain per day does the country need? (the population of the whole country is about 1.37 × 10, and the result is expressed by scientific notation)
2. It is estimated that the economic loss caused by land desertification in one day is about 150 million yuan. The economic loss caused by land desertification in China in one year is expressed by scientific counting method. (1 year is calculated as 365 days, and the results are expressed by scientific notation)
(1) The 9th power of 0.5x1.37x10 = the 8th power of 6.285x10
(2) 365x150 million yuan = the 10th power of 5.475x10
How to use scientific counting method to count, there must be an example of using numbers
For example, China has a population of more than 1.3 billion, and then ask you to use scientific counting method to express and keep two significant figures
The population of China is 1.3 * 10 ^ 9
RELATED INFORMATIONS
- 1. 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
- 2. 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?
- 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 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
- 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 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
- 5. 1000 words on saving water Write for yourself
- 6. Experience of saving water To junior high school sound level, not too much
- 7. 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?
- 8. 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?
- 9. The significance of water saving It's better to be concise. It's better not to be lengthy!
- 10. The area of the Forbidden City is 720000 square meters, 160000 square meters less than that of Tiananmen Square. How many square meters is Tiananmen Square?
- 11. The speed of light in vacuum is about 299792458 M / s, which can be expressed as______ M / S (keep three significant digits)
- 12. 3000000m, expressed by scientific counting method as (keep two significant numbers)
- 13. -0.00002006 scientific counting method
- 14. -0.0000025 is expressed by scientific notation as______ ．
- 15. What is 0.00001 scientific counting method?
- 16. 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!
- 17. 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
- 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. 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
- 20. 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