The wonderful story of Chinese characters

The wonder of Chinese characters lies in:
1. One word with many tones
2. The strokes are in order
3. Write fast

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4. 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?
5. 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
6. 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 =?
7. 2.1 0.5 = 0.840.2 fill in the operation symbol
8. 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?
9. 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
10. The result is equal to 1988.4 = 1984 by adding proper operation symbol between the following seven 4
11. Can you give me an example to illustrate the wonder of Chinese characters? Not too long, just simple! About 50 words It's due tomorrow
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