The distance from the moon to the earth's surface is about 384000000 meters, which is expressed as the distance in scientific notation (two significant numbers are reserved)______ Rice

384000000 = 3.8 × 108

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1. Flying around the earth and the moon! First of all, I'm a little Bai, so I asked the question, why does an aircraft (such as Tiangong, chang'e-3, etc.) have to fly around the earth for a long time before it can run to the moon when it is launched? When it is approaching the moon, it will fly around the moon for a long time before it can land, instead of flying vertically to the moon! Please tell me, and don't copy other people's answers, I've seen the answers given by others, but they are not specific enough! Rockets can't directly raise the aircraft to a certain speed, can they fly around the earth to a certain speed? Why do many people say that they save fuel? Why do they save fuel?
2. How many years does it take to go from the earth to the moon by ordinary plane
3. What is the distance between the moon and the earth? The nearest distance
4. How many kilometers is the distance between the moon and the earth?
5. How many kilometers is the moon from the earth on average
6. How many kilometers is the moon from the earth? Accurate to 0.0001
7. How many kilometers is the distance between the earth and the moon?
8. The following numbers are recorded by scientific counting method: (1) the earth is about 150 million kilometers away from the sun. (2) the reserves of coal on the earth are estimated to be more than 15 trillion tons Write down the following numbers by scientific counting method: (1) The earth is about 150 million kilometers away from the sun (2) The reserves of coal on earth are estimated to be more than 15 trillion tons (3) The mass of the moon is about 7 340 000 (4) The number of stars in the Milky way is about 160 million tons (5) The radius of the earth's orbit around the sun is about 149 000 km (6) There are about 25 million molecules in 1 cm of air
9. How many kilometers does the earth travel around the sun per second
10. The distance between the earth and the sun is about 1.5 × 10 ^ 8 km. Find the average speed of the earth around the sun (expressed by the scientific counting method in kilometer seconds, 1 365 days
11. On a map with a scale of 1:300000, the distance between a and B is 12 cm. On another map with a scale of 1:300000, the distance between a and B is 12 cm
12. On the map with the scale of 1:300000, the distance between a and B is 12 cm. If we use the scale of 1:500000, the distance between a and B is 12 cm On a map with a scale of 1:300000, the distance between a and B is 12 cm. If we use a scale of 1:500000, how many cm should we draw?
13. On a map with a scale of 1:300000, the distance between a and B is 6cm. On a map with a scale of 1:200000, the distance between a and B is 6cm How many centimetres is the distance between them?
14. On the map with a scale of 300000 / 1, the distance between a and B is 14 cm, and the actual distance between a and B is () km
15. On a map with a scale of 1:300000, the distance between a and B is 12 cm. If we use a scale of 1:50000 instead On a map with a scale of 1:300000, the distance between a and B is 12 cm. If we use a scale of 1:50000, how many cm should we draw the distance between a and B?
16. On a map with a scale of 1:300000, the distance of 1cm on the map represents the actual distance of () km? How many times is the distance on the graph?
17. On a map with a scale of 1:300000, the distance between a and B is 5.5cm. If it is changed to a map with a scale of 1:500000, the distance between a and B is 5.5cm fast
18. On a map with a scale of 1:300000, the distance between the two places is 18 cm; on a map with a scale of 1:200000, how many cm should it be?
19. On a map, the scale is 1:300000, the distance of A. B is 18 cm, and the actual distance of A. B is () km
20. On a map with a scale of 1:300000, the distance between a and B is 12 cm, and the actual distance between them is 12 cm______ If the scale of 1:500000 is used, the distance between a and B should be drawn______ Cm