3123000 scientific notation

3.123*10^6

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1. 2.83 billion in scientific notation
2. 158.345 billion expressed in scientific notation (3-digit approximation reserved)
3. How to express 3600.6 in scientific notation
4. How to express 50340.6 in scientific notation
5. 3 hours 18 minutes 36 seconds = () hours
6. How many 10 seconds are there in six hours?
7. 5 out of 6 hours = (?) seconds
8. 2.89 million in scientific notation
9. 120000 scientific notation
10. 7.35 million tons in scientific notation
11. The following numbers are expressed by scientific notation: 0.000 000 09 cm, 0.000 000 2 cm The weight of one pill is about 0.156 G
12. In scientific notation: 0.003 There are these numbers: 0.003 zero point zero zero zero four five eight hundred and forty thousand I need a reward!
13. 0.000 000567 is expressed by scientific counting method
14. The scientific counting method changes 0.000 768 to scientific counting method Can you help me change 0.000 768 to scientific counting
15. Fast use the rounding method to approximate the following numbers according to the requirements and express them with scientific notation: Use the rounding method to approximate the following numbers according to the requirements, and use the scientific counting method to express them: (1) From the launch of the space probe "Pioneer 10" to the time when people received its last signal in February 2003, it had already flown 12 200 000 km away from the earth (with two significant numbers reserved); (2) June 5, 2005 is the 34th World Environment Day. At present, the total ocean area in the world is about 361059000 km2 (three valid figures are reserved); (3) In 2003, China's gross domestic product (GDP) was 11669.4 billion yuan; (4) Light year is the unit of distance in astronomy. One light year is about 9 500 000 km (accurate to 100 million bits); (5) The annual power consumption of street lighting in a city is about 42 million kW / h (accurate to one million kW / h) This is the first day of junior high school
16. Suppose that the reject rate of a product is 0.005, take any 1000 pieces from this batch of products, and calculate the probability that the reject rate is not greater than 0.007 eight thousand one hundred and fifty-nine
17. 200000m = km, 500000cm = m, 0.0035mm = m, 0.005M = km, 0.007 μ M = m, 0.00056m = nm, calculated by scientific counting method!
18. Removing the decimal point of 0.007 is to enlarge 0.007 () A. by 1000 times. B. by 1000 times. C. by 10000 times Be correct
19. How many 1 / 1000 in 0.007
20. Use scientific counting method to express the following numbers: 1000 = 500000 = 35000 = 0.001 = 0.007 = 0.00056=