![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
1. Known polynomial a times the fourth power of X + B times the third power of X + C times the second power of X + D times the fourth power of X + e = (X-2). 1. Find the value of a + B + C + D + E. 2. Find the value of B + D 2. To know that a = 2x to the second power + 3xy-2x-1, B = - x to the second power + XY-1, and the value of 3A + 6B has nothing to do with the value of X, find the value of Y 3.8. If a = x to the second power - xy-y to the second power, B = - 2xy-3y to the second power, then 2a-3b=_____________________ .
1. (1) the whole is 0, only each of them is 0, and because any power of 0 is 0, so the title is 0
(2) A = - 36 * x to the fourth power - 5x + 5
(3) 15 or - 9
2.3A+6B
=3 * (2x square + 3xy-2x-1) + 6 * (x square + XY-1)
=12 * x square + 15 * xy-6x-9
Because it's not about X,
So, x = 0
So 12 * x square + 15 * xy-6x = 0
So y = (2-4x) / 5 = 2 / 5
A small boat was sailing against the current. A kettle fell from the boat and floated along the water. When it was found, the kettle was 3 kilometers away from the boat. It is known that the speed of the boat is 6 kilometers per hour and the water speed is 2 kilometers per hour. How long does it take for the boat to catch up with the kettle after turning around?
This is a catch-up problem
The speed of the ship in the downstream is 6 + 2 = 8 (km / h)
Pursuit time: 3 / (8-2) = 0.5 (hour)
Three eighths of a barrel of gasoline is poured out. It's exactly 24kg. How much is the weight of this barrel of oil? Set up an equation
The average yield of wheat is 4.8t in ten hectare wheat field?
This barrel of oil weighs X
3/8x=24
x=24/(3/8)=64
4.8*10*0.85=40.8t
RELATED INFORMATIONS
- 1. If A-1 / 5B = B-1 / 4A, the ratio of a to B is () In the first run, when a runs to the end, B is still 20 meters short; in the second run, a starts from 20 meters behind the starting line, and B starts from the starting line. The speed of the two runners is the same as that of the first run. In the second run, who reaches the end first? How many meters is the difference between the other?
- 2. There are four, five and six security guards in three schools a, B and C in a city. In order to strengthen the security force of the school, the three schools decided to increase the number of security guards. It is known that each school of a, B and C will increase at least two security guards, and the number of security guards after the increase of school C is twice that of school A. if the total number of security guards in the three schools is 14, try to find all the security increase schemes that meet the requirements
- 3. The fourth national sports conference was held in Hefei in May 2010. In order to welcome the arrival of the fourth national sports conference, Hefei Xiaoyaojin amusement park speculated 1500000 yuan to introduce a amusement facility. If the maintenance cost is not included, it is estimated that 330000 yuan will be generated after the opening. After the opening of the amusement facility, the accumulated maintenance cost from the first month to the x month is y 10000 yuan, and y = ax & sup2; + BX; If we call the income and maintenance expenses as the net income w ten thousand yuan (1) if the maintenance cost is 20000 yuan in the first month and 40000 yuan in the second month, the function expressions of Y and X and W about X are obtained respectively; (2) a few months after the opening of the amusement park, the net income of the amusement park is the largest? How many ten thousand yuan is the largest income? (3) can the amusement park recover its investment in a few months? The net income of 10000 yuan is the income generated by deducting the investment and maintenance expenses.
- 4. When a shopping mall sells a certain commodity, it will increase the purchase price of the commodity by 25% as the sales price in the first month, making a total profit of 6000 yuan. In the second month, the shopping mall will carry out promotional activities, and increase the purchase price of the commodity by 10% as the sales price. In the second month, it will increase 80 pieces compared with the first month, and make a profit of 400 yuan more than the first month? How many items are sold in the second month?
- 5. In the acute angle B, there are five adjacent circumscribed unequal circles, all of which are tangent to the edge of angle B (the radii are arranged from small to large). The radii are R1, R2, R3, R4 and R5 respectively. If the minimum radius R1 = 1, the maximum radius R5 = 81. Find the degree of angle B The angle is 60 degrees, I know. What I want is the proof process
- 6. 1. To know m-2n = - 2, find the value of - 3-2m + 4N 2. Such a question, "a = 2A & sup2; + 2B & sup2; - 3C & sup2;, B = 3A & sup2; - B & sup2; - 2C & sup2;, C = C & sup2; + 2A & sup2; - 3B & sup2;, when a = 1, B = 2, C = 3, find the value of A-B + C". One student pointed out that the B = 2, C = 3 given in the question is redundant. Is his saying reasonable? Why?
- 7. A math problem in junior high school= A linear equation with one variable 1 / 3A + X / 3 = 0 and 4a-4y-4 = 0 have the same solution 1) The value of a 2）（x+y)+（x+y）^2+(x+y)^3+…… +|The value of (x + y) ^ 2009
- 8. There is a desert where a car travels 200 kilometers every day, and each car can only be fully loaded with gasoline for 24 days. One day, a and B cars eat from place a at the same time. It is stipulated that no matter how far they drive, they must return to place a along the original road. In order to make car a drive as far as possible, after driving for a certain distance, car B only leaves the gasoline for himself to return to place a, and supplies the remaining gasoline to car a, What is the longest distance a car can drive? ------------------------------------------------------- One day a and B cars start from a at the same time! (I have the wrong number) Can you make an equation?
- 9. If the equation 3x ^ 2-10x + M = 0 has two real roots with the same sign but not equal, then the value range of M is
- 10. The sum of the numerator and denominator of the simplest fraction of a number is 22. The numerator is reduced by 3, and the denominator is increased by 3. The fraction is 3 out of 8. What is the original fraction!
- 11. 1. A car drives from place a to place B at the speed of 50 kilometers per hour, 80 kilometers away. The gasoline can run for 2 hours at most. In the case of no refueling on the way, in order to ensure the return to the starting place, it should drive back at most () kilometers 2. There are 12 cubic products of 1 cubic decimeter. Please design a rectangular packing box for him. There are () different packing methods. When the length of the packing box is () decimeter, the width is () decimeter, and the height is () decimeter, the packing paper is saved most. At least () square decimeter of packing paper is needed (the joint is ignored)
- 12. 1、 Cut a cylinder block into the largest cone. The volume of the cut part is () of the volume of the cone 2、 The volume of cylinder with bottom diameter of 20 cm and height of 30 cm (), the volume of cone with bottom diameter of 20 cm and height of 30 cm (), the volume of cylinder with bottom circumference of 12.56 cm and height of 3 cm (), the volume of cone with bottom circumference of 12.56 cm and height of 3 cm ()
- 13. 1. In a sales promotion, a kind of computer only sold for 6840 yuan, 760 yuan cheaper than the original price. How much is the price reduction of this kind of computer? 2. Guangming automobile factory produced 1260 cars in November, more than 20% of the original plan. How many cars did it plan to produce in November? 3. Granny Zhang deposits 3000 yuan in the bank for two years with an annual interest rate of 4.68%. After maturity, how much yuan can granny Zhang get back with the after tax interest? (5% interest tax) 4. A box of candy weighs 500 grams. If you eat three fifths of the candy and the rest weighs 224 grams, how many grams does the box weigh? 5. Fill in the blanks: the hotel's turnover is about 300000 per month, and it pays 15000 business tax. What's the tax rate? 6. Fill in the blanks: cut a circle into a rectangle, 31.4cm long and equal to the radius of the circle. What is the radius of the circle? 7. Judgment question: in order to clearly show the relationship between the quantity of each part and the total quantity, use () statistical chart. A broken line B bar C sector 8. Judgment question: one third of Xiaohong's height is equal to one fourth of Xiaoqiang's height. Xiaohong and Xiaoqiang are taller than each other. The result is that a Xiaohong is as tall as B Xiaoqiang and C Xiaoqiang
- 14. Answer to the ninth question in the standard volume of Chinese unit 2 in grade 4 of Huanggang Junior Champion
- 15. Answers to the fourth grade Chinese PEP Edition
- 16. Fourth grade volume 1 answers to the No.1 student in Chinese
- 17. Fifth grade volume I mathematics Huanggang little champion Volume I page 57 The problem is to find the area of the shadow in the following figure The problem is to find the area of the shadow in the following figure The first figure is a parallelogram. Its top bottom is 5cm, and the triangle without coloring is 3.6cm high. Its bottom is 3cm, and the shadow part is calculated.
- 18. Fifth grade mathematics Huanggang small number one answer (all) thank you! Mathematics!
- 19. Answers to page 43 of mathematics ability training and test in Grade 6 of Zongyang primary school
- 20. Primary school grade 6 Volume 1 mathematics synchronous exploration unit 3 test all the answers to the good to 200 It's urgent