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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)
1. 1. A car drives from place a to place B at a 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 (50) kilometers. 2 * 50 / 2 = 50 (kilometers)
2. 2. There are 12 cubic products of 1 cubic decimeter. Please design a rectangular packing box for him. There are (3) different packing methods. When the length of the packing box is (3) decimeter, the width is (4) decimeter, and the height is (1) decimeter, the packing paper is saved most. At least (48) square decimeter of packing paper is needed (the joint is ignored)
1、 If the width of a rectangle remains unchanged, the length increases by 3cm, and the area increases by 12cm. If the length remains unchanged, the width increases by 2cm, and the area increases by 14cm. The perimeter of the rectangle is () cm, and the area is () cm
2、 The circumference and height of the bottom surface of a cylinder are equal. The side of the cylinder is cut along the height and expanded. After expansion, the ratio of () to the diameter of the bottom surface is ()
3、 Take a right side of a right triangle as an axis and rotate it for one circle, then you can get a (), the radius of the bottom is (), and the height is ()
1. The width is 4 and the length is 7
Perimeter 22 area 28
2. The second question of a square is: what is the ratio of the less thing to the diameter of the bottom? If the side of the square is long, 3.14
3. The radius of cone bottom is the height of right triangle
-2 power 2006 power 11 Power 12 power
(- quarter) - (- 1) + (two thirds) x (- three thirds)
Original formula = 4 & # 178; - 1 + [2 / 3 × (- 3 / 2)] ^ 11 × (- 3 / 2)
=16-1+(-1)×(-3/2)
=15+3/2
=16-1+3/2
=16.5
RELATED INFORMATIONS
- 1. 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=_____________________ .
- 2. 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?
- 3. 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
- 4. 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.
- 5. 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?
- 6. 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
- 7. 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?
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- 9. 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?
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