Thanksgiving Story (about 20 words)

There was a single woman who had just moved. She found that there was a poor family, a widow and two children living next door. One night, the electricity suddenly stopped in that area, and the woman had to light a candle by herself. After a while, she heard someone knocking at the door. It turned out that it was the little child of the next door neighbor. He asked nervously, "aunt, please

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1. The legend of the origin of Chinese characters (50 characters) In addition to Cangjie's creation of characters I want 50 words or less
2. 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?
3. 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
4. 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 =?
5. 2.1 0.5 = 0.840.2 fill in the operation symbol
6. 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?
7. 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
8. The result is equal to 1988.4 = 1984 by adding proper operation symbol between the following seven 4
9. 4 = 1984, fill in the appropriate symbols between the seven 4's (bracket can be added)
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