If the values of a, B and C in the fraction 3C / A + B are changed to 3 / 7, the relationship between the value of the fraction and the value of the original fraction is____

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• 1. After 2.56s, the return signal is received on the ground. According to this data, the distance between the moon and the earth is calculated?
• 2. It is accurate and rapid to measure the distance with laser. A laser signal is sent from the earth to the moon, and the signal reflected from the moon surface is received in about 2.56 seconds
• 3. A laser signal is sent from the earth to the moon, and the signal reflected from the moon is received in about 2.56 seconds. The known speed of light is 300000 kilometers per second. What is the distance between the moon and the earth?
• 4. A laser signal is sent from the earth to the moon, and the signal reflected from the moon is received after about 2.56 seconds. The known speed of light is 300000 km / s What's the distance between the moon and the earth There should be a formula
• 5. How long does it take from the earth to the moon by spaceship?
• 6. How long does it take to fly from the earth to the moon
• 7. The laser rangefinder emits a laser pulse beam at the target The laser rangefinder emits a laser pulse beam to the target, receives the reflected laser beam, and measures the time taken for the laser column to go back and forth. Then the distance between the measured celestial body and the earth can be calculated. The distance between the earth and the moon is the eighth power of 3.8 * 10, Now the distance between the earth and the moon can be measured by laser rangefinder with an accuracy of plus or minus 10cm. Laser ranging technology is widely used in man-made earth satellite monitoring, geodesy and other aspects Known: Ask for: I will. Come on in~
• 8. At present, the measuring personnel use a laser rangefinder to send a pulsed laser beam to the moon and receive the reflected laser beam. They measure that the time for the laser to go back and forth is 2.54s. How many meters is the distance between the moon and the earth? (the speed of light in vacuum is 3 times 10 octave)
• 9. The principle of laser rangefinder is understood. The distance can be calculated by calculating the time taken to receive the reflected laser, but what we don't understand is how to send it back? When a flashlight is used to irradiate a plane mirror three or four meters away, it will reflect back light, but when it is used to irradiate ordinary objects such as tables and stools (especially in the bright outdoor environment), it will not be seen that the light emitted by a flashlight will reflect back. Even the common laser lamp similar to a flashlight can not see the reflected light when it is three or four meters away in this environment, Is the reflection ability of the lunar surface so strong? How does the object reflect back the emitted beam or something else
• 10. The nearest star outside the solar system to the earth is called the neighboring star, which is 3600, 13000, 13000 kilometers away from the earth. Q: how long does it take for the light from the neighboring star to reach the earth? (it is known that the speed of light is 300000 km / s, which is calculated by 30000000 seconds per year. The results are expressed by scientific notation.)
• 11. Simplification: (1) (5ab) / (3C) × (- (12c ^ 2) / (5ab ^ 2)) / / 3C / A; (2) 4 / (x-1) - x + 1
• 12. X-Y = 3 7-x + Y-Y square + x square Given X-Y = 3, find the value of the algebraic formula 7-x + Y - (Y-X) & sup2
• 13. The square of 2 (Y-X) - 7 (X-Y) + 6 (X-Y) - 3 (Y-X)
• 14. Merge the square of homology 3 (X-Y) - 7 (X-Y) + 8 (X-Y) + 6 (X-Y) Square of 3 (X-Y) - 7 (X-Y) + square of 8 (X-Y) + 6 (X-Y)
• 15. Merge similar terms: 5 (x + y) cubic - 2 (X-Y) quartic - 2 (x + y) cubic + (Y-X) quartic
• 16. |-4 | - (- 2) to the second power + (- 1) to the third power - 1 divided by 2 =? Quick, quick
• 17. (- 2) x power = (- 2) 6 power divided by (- 2) 5x power
• 18. How much is the 79th power of 12 divided by 7? emergency
• 19. What is the 1 / 3 power of 0.79? Is the third power of a number the root of this number?
• 20. What is the 79th power of 85