My sunflower composition 400-405 words, grade 4 composition urgent!

It's not good for children to copy homework. I know it's better if you don't finish your homework in summer vacation

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1. Uncle Wang raised 45 chickens and ducks, of which the chicken is 4 / 5 of the duck. How many ducks do you raise!
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4. Excuse me, how to get the mathematical understanding of exercise 5.7 (186 pages) in the mathematics book of the first volume of the seventh grade? The diameter of two cylindrical containers is 4cm and 8cm respectively, and the height is 39cm and 10cm respectively. We first fill the second container with water, and then pour it into the first container. Q: after pouring, how many centimeters is the water surface in the first container from the bottle mouth? Xiao Ming did this: let the water surface in the first container be x cm away from the bottle mouth after pouring. The equation Π· 2 & sup2; (39-x) = Π· 4 & sup2; · 10 was solved, and x = - 1 Can you give a reasonable explanation for his result? Another topic: A bookshelf is 88cm wide, and a certain volume is full of the first volume of mathematics books and Chinese books, a total of 90. Xiaoming measured that a mathematics book is 0.8cm thick, and a Chinese book is 1.2cm thick. Do you know how many mathematics books and Chinese books are on this bookshelf?
5. A question about rabbit sequence ①①②③⑤⑧…… (rabbit sequence) if so, what is the 342?
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7. There are three red, white and black glass balls in the box. How many balls can you feel from the box to ensure that you can touch the same color balls?
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11. What is the common factor of 21 and 28 What are the common factors of 30 and 24, 16 and 35, 16 and 4
12. English translation It's the new goal English eight on Translation of 3A on page 63 of Unit10 section B Translation of 3A on page 67 and 69 of Unit11 section A and B Translation of 3A on page 73 and 75 of Unit12 section A and B It's coming
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16. A batch of books were delivered to the bookstore, and 7 / 12 of them were sold on the first day. Another 170 copies were sold on the second day, and 180 copies remained. How many books are there in total?
17. First: a cone, the volume is 480 cubic centimeters, the height is 20 centimeters. How many square centimeters is its bottom area? The second way: a pile of coal is transported into the school canteen and piled into an approximate cone. Its bottom diameter is 8 meters and its height is 1.2 meters. How many cubic meters of coal is there? The third course: there is a gravel pile which is similar to a cone. The perimeter of its bottom surface is 18.84 meters and the height is 8 meters. How many meters can you lay on a 10 meter wide road with this pile of gravel 10 cm thick?
18. 1. A square sheet of iron with a circumference of 1.2 meters. After cutting it into four equal largest circles, how much scrap is left? 2. The land area on the earth is about 3.554 billion square kilometers, and the ocean area is about 300 million square kilometers. Write the ratio of land area and ocean area, and simplify it 3. A kind of liquid medicine is made of powder and water in the ratio of 1:100. If you want to prepare 404kg of this liquid medicine, how many kg of powder and water are needed? The netizen that can please come out formula, the netizen that lists solution idea gets reward cent chance to be higher We have to work out the formula!
19. 1. Mix 3 kg milk sugar of 7.6 yuan per kilogram, 5 kg fruit sugar of 5.4 yuan per kilogram and 4 kg crisp sugar of 6.5 yuan per kilogram to make assorted sugar. How much is the price of this assorted sugar per kilogram? 2. One workshop of Xinfeng agricultural machinery factory processes 2480 parts. Originally, it processes 100 parts per day. Actually, it is completed two days ahead of schedule. How many parts per day? 3. One workshop of Xinfeng agricultural machinery factory processes 2480 parts. Originally, it processes 100 parts a day. After 20 days of processing, it processes 120 parts a day instead. How many days can the task be completed? 4. Xiaoming's average score of four subjects was 90 before the publication of his history scores. After the publication of his history scores, his average score increased by two points. How many points did he get in the history test? 5. To build a canal, 15 people can finish 2520 meters in 24 days. According to this calculation, 10 people need to build 2100 meters. How many days does it take? 6. A team has been processing 960 cashmere sweaters for 37 days, and there are 540 left unfinished. According to this process, can we finish the task in a few days? 7. To build a road, team a will take 6 days to complete and team B will take 10 days to complete. Due to other arrangements, team a will build 3 kilometers less every day, while team B will build 2 kilometers less every day. After 4 days, how many kilometers is the road? 8. There are 2100Kg of rice and 525kg of flour in the grain processing plant, which are respectively put into jute bags and flour bags. The number of bags is the same. It is known that each bag of rice weighs 75kg more than flour. How many kg do each bag of rice and flour weigh? 9. The distance between the two cities is 1680 km. The two trains start from the two cities at the same time. After 15 hours, the two trains meet. It is known that the speed difference between the two trains is 8 km per hour. How many kilometers per hour do the two trains travel?
20. When the result of (2mx * - x * + 3x + 1) - (5x * - 4Y * + 3x) has nothing to do with the value of X, find the value of 3M & sup2; - {(2m-5) = 5m * & sup2; + 3M} *It means square