Let a and B be rational numbers, and satisfy the condition of big radical a-small radical 12 = B + radical 3, and prove one part of root a + B I don't know much about symbols, -

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• 1. 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
• 2. 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?
• 3. 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!
• 4. 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?
• 5. 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?
• 6. Simple calculation of 3 / 50 * 49
• 7. What are the rules and regulations
• 8. 1 / 2, - 3 / 4,7 / 8, - 15 / 16,31 / 32 what is the number 2010 of this sequence? What is the number n?
• 9. 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
• 10. What is the common factor of 21 and 28 What are the common factors of 30 and 24, 16 and 35, 16 and 4
• 11. If X. (power 0 of x) is the root of the quadratic equation AX & sup2; + BX + C = 0 (a ≠ 0), a = B & sup2; - 4ac, B = (2aX. + b) & sup2;. Try to compare the size of a and B
• 12. How many pairs of integers x and y satisfy the equation y ^ 4 + 2x ^ 4 + 1 = 4x ^ 2 * y?
• 13. Solving equation (x ^ 2 + 1) ^ 2-x ^ 2 = 3
• 14. Xiaoming said to Xiaohua, "my age plus your age, and when I was your age, my age was 48." how old is Xiaohua now?
• 15. A math problem in grade two of junior high school In the plane rectangular coordinate system, the point whose abscissa and ordinate are integers is called integral point. The unit length of the coordinate axis is 1. The integral point P starts from the origin o, and its velocity is 1 unit length / s, and it only moves to the right or upward. Two integral points (0,1), (1,0) can be reached in one second, three integral points (0,2), (1,1), (2,0) can be reached in two seconds, and (0,3), (1,2), (2,2) can be reached in three seconds, 1) (3,0) four integral points (1) When p starts from O for 4 seconds, which punctuality can p reach? (2) How many seconds did P move when it reached (65,3)? (3) Write all the punctual points you can reach in 8 seconds
• 16. As shown in the figure, ab = AC, ∠ BAC = 120 ° in △ ABC, the vertical bisector EF of AC intersects AC at point E and BC at point F. verification: BF = 2cf
• 17. The annual electricity price of an area is 0.8 yuan and the annual electricity consumption is 100 million kwh. The annual plan is to adjust the electricity price to 0.55-0.75 yuan. According to calculation, if the electricity price is adjusted to X Yuan, the new electricity consumption of this year is y billion kWh and (x-0.4) yuan in inverse proportion, and when x = 0.65, y = 0.8 billion kwh (1) Write the relation between Y and X (2) If the electricity price is not higher than 0.5 yuan, at least how many kilowatt hours of new electricity will be added?
• 18. What is logical reasoning
• 19. Logical reasoning for help, thank you one At the beginning of the year, in order to motivate employees to work hard, a company decided to select the "star of the month" according to their monthly performance. In the first 10 months of the year, Wang was elected as the "star of the month" only in four consecutive months. His other three colleagues, Zheng, Wu and Zhou, also did this (1) Wang and Zheng were elected at the same time for only three months; (2) Zheng and Wu were elected at the same time for only three months; (3) Wang and Zhou were not elected in the same month; (4) Only two were elected at the same time in July; (5) At least one was elected in January According to the above information, what is the month in which Wang was elected as the "star of the month" A. January to April B. March to June C. April to July D. May to August
• 20. logical reasoning 1. If Zhang Sheng likes photography, he will like traveling. If he doesn't like photography, he will like driving. However, if Zhang Sheng doesn't like traveling, he won't be interested in driving. Therefore, Zhang Sheng () A like traveling B like driving C don't like driving d like photography 2 'the unit price of a store's goods is 75 yuan. It can sell 500 pieces. If the unit price is 1 yuan, it will sell 20 pieces less. In order to make the sales bigger, the unit price can be set as () A 50 yuan B 28 yuan C 27 yuan d 20 yuan 3. Xinjiang: Jiangsu: Suzhou () A Beijing: Nanjing: Yangtze River B Aerospace: Spacecraft: Astronauts C Yunnan: Anhui: Hefei D Shandong: Liaoning: Qingdao That's the second question, so I can't understand it