In the process of solving the equation, if you want to change the position of the number, do you want to change the operation symbol?

If the number is moved to the opposite side of the equal sign, the number symbol will change. If it is on the same side, the symbol will not change

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2. The following codes are used for the access, processing and transmission of Chinese characters GB code a B internal code C location code D-code
3. 10. Science and technology is the first productive force, and it is the concentrated embodiment and main symbol of () A. Advanced productive forces B. Advanced production relations C. Four modernizations D. Talent and knowledge
4. The symbol f represents an operation The symbol "F" represents an operation, and its operation results for some numbers are as follows: (1) f (1) = 0, f (2) = - 1, f (3) = 2, f (4) = - 3 ·; (2) f（1/2）=2,f（1/3）=3,f（1/4）=4,f（1/5）=5,···. According to the above rule, f (1 / 2013) + F (2014)
5. A complete collection of chemical equation symbols As long as it is a chemical equation symbol, it should be complete Sorry, I don't have any wealth
6. The meaning of symbol in chemical equation______ ，“=”______ ，“↑”______ ，“△”______ ，“↓”______ ．
7. What is the meaning of symbols in chemical equation To be specific, such as the meaning of the arrow, the meaning of the arrow on the left and right
8. Gas symbol
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10. In addition to numbers, there are Chinese characters and letters in the middle code of China's car license plate, which is represented by the abbreviation of each province ()
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12. 4 = 1984, fill in the appropriate symbols between the seven 4's (bracket can be added)
13. The result is equal to 1988.4 = 1984 by adding proper operation symbol between the following seven 4
14. 0.84 () 0.2 = 0.6 () 7 2.5 () 5 = 0.025 () 0.05 3.9 () 0.6 = 9 () 0.5 fill in the operation symbol
15. By adding proper arithmetic symbols between the seven four, the result of operation can be 1984.4 = 1984 Add proper arithmetic sign between 7 4 to make the result of operation be 1984 In addition, one train is 160 meters long, and it takes 30 seconds for the whole train to cross the 440 meter bridge. How many meters does this train travel per second?
16. 2.1 0.5 = 0.840.2 fill in the operation symbol
17. For any non-zero natural numbers x and y, the symbol "√" is defined to represent an operation, and X √ y = {[x * x-x * (x-1)] + y * y * y-5.2} * 2-1 So 5 √ 5 =?
18. For any non-zero natural number, x, y, the specified symbol "△" represents an operation, and X △ y = 2XY divided by X + y, find 4 △ 5
19. 1: For any non-zero natural number x y, the symbol "△" is defined to represent an operation, and X △ y = 2XY of X + y, then 4 △ 5 is obtained 2: Three workshops produce a batch of parts. The first workshop produces a part, the second workshop produces the remaining 20% of the first workshop, and the third workshop produces 800, just finishing the task. How many parts are produced in the second and third workshop? 3: Ziqiang's savings are 30 yuan more than Jiahui's, and 3 / 4 of Jiahui's savings are 10 yuan less than 2 / 3 of Ziqiang's?
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