The third grade construction site transported 12 tons of cement, 8 tons per truck, and the yellow sand was six times the weight of cement. How many tons of yellow sand?

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• 1. The side area of a cylinder is 314 square centimeters, and its height is 20 centimeters. How many cubic decimeters is the volume of this cylinder
• 2. A number is a multiple of 9 and a factor of 72. This number should be
• 3. Given that the quadratic power of A-6A + 9 and / B-1 / are opposite to each other, what is the result of calculating the cubic power of a, the cubic power of B + the quadratic power of 2a and the quadratic power of B + AB
• 4. Four numbers are equal to 9, with an expression to achieve the result is equal to 100 Four numbers are equal to 9, can you use an expression to achieve the result equal to 100
• 5. Note: no matter what value x and Y take, the value of polynomial x ^ 2 + y ^ 2 + 2x + 4Y + 8 is always positive
• 6. On the calendar of a month, can you circle 3 * 3 numbers with a square so that the sum of these 9 numbers is 93? If so, what are the dates of the nine days?
• 7. How many solutions are there for the quadratic equation 3x + y = 10, positive integer solutions
• 8. The students of class A, class B and class C planted 66 trees. The trees planted in class A were twice as many as those planted in class B. the ratio of trees planted in class C and class B was 2:3 How many trees to plant each? (cubic equation)
• 9. If lx-3l + LX + 5L = 0, then x + y=
• 10. According to the previous statistical data, if the retail price is set at 4 yuan per bottle, 400 bottles can be sold every month; if the retail price is reduced by 0.05 yuan, 40 bottles can be sold more. & nbsp; therefore, please design a plan for the store: how much yuan should the selling price be set and how many bottles of this kind of beverage can be purchased every month to get the maximum profit?
• 11. A physics problem about density The mass of a stone is 15g, and the total mass of a glass bottle filled with water is 188g. Now put the stone into the bottle filled with water, and the total mass of the glass bottle is 197g
• 12. At the Shanghai World Expo, 100 fuel cell sightseeing vehicles were in the Expo site. They drank hydrogen and produced water, realizing zero emission It is necessary to add 30% KOH solution into the fuel cell. Now there are 10kg 10% KOH solution, 14kg KOH solid and proper amount of distilled water. How many kg of 30% KOH solution can be prepared?
• 13. 1 / 2 bracket 1 / 3 (x-1) - 6 bracket = 1 the process of solving equation
• 14. Multiplication and division of rational numbers
• 15. (make sure you're right!)! 1. It is known that the perimeter of the square is C, the side length of the square is (), and the area is () 2. A travels a kilometer per hour, B travels B kilometer per hour (a + b) × 3 denotes () (a-b) × 5 means () 3. Express the following quantitative relationship by equation (1) M is 9 times more than 38 (2) Three fifths (3 / 5) of 100 m is less than 27:1 (3) M is 78:1 more than one tenth (1 / 10) of 372 5. There are 480 pages in a book. After 8 days of reading, Xiao Fang still has 120 pages left. Suppose that he reads page a every day, then () = 120
• 16. Given that there are two points a and B on the number axis, and the distance between the two points a and B is 3, and the distance between the point a and the origin o is 2, then what are all the points B satisfying the conditions
• 17. We know that the equation kx2 + (2k-3) x + K-3 = 0 for X. (1) prove that the equation always has real roots; (2) when k takes which integers, the two real roots of the equation kx2 + (2k-3) x + K-3 = 0 for X are negative integers?
• 18. As shown in the figure, a computing device has a data input port a and an output port B of calculation results. The following table shows some data input by Xiaoming and the corresponding output results of these data after calculation by the device: according to the calculation rule of this computing device, if the number of input is 10, then the number of output is 10______ ． A 1 2 3 4 5 B 2 5 10 17 26
• 19. When the elevator in the mine starts to rise at a constant speed from a standstill, and reaches 4m / s after 5S, it rises at this speed for 20s, then rises at a constant speed, and stops at the wellhead after 4S, then the depth of the mine is______ m．
• 20. {an} is an arithmetic sequence A3 = 12 S12 > 0 S13