On the formula of quadratic function
Y = the square of AX + the square of BX + C
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- 1. During the promotion period of a shopping mall, it is stipulated that all goods in the shopping mall are sold at 80% of the price. At the same time, when customers spend a certain amount of money in the shopping mall, they can get the corresponding amount of lottery tickets according to the following scheme. (lottery shopping no longer enjoys preferential treatment) the range of consumption amount x (yuan) 200 ≤ x < 400 ≤ x < 500 ≤ x < 700 The amount of lottery ticket (yuan) 30 60 100 According to the above promotion method, customers can get double discounts when shopping in the mall. If Mr. Hu gets a discount of 120 yuan when buying a household appliance in the mall, the price of the appliance is______ Yuan
- 2. (1.29+1.37+1.45+.+1.85)/(1.47+2*0.84)≈( ) Remember: keep two decimal places!
- 3. The original price of a washing machine is 1450 yuan. Now it is sold at a 20% discount, but the price is still higher than the cost. 19. How much is the cost of this washing machine?
- 4. After a polygon cuts an angle from a vertex, the sum of the inner angles of the new polygon is 2520 degrees
- 5. As shown in the figure, when the board with length of L = 2M and mass of M = 8kg is placed on the horizontal ground, and the speed of the board moving to the right is v = 6m / s, a small block with mass of M = 2kg regardless of size is gently placed at the front end of the board. The dynamic friction coefficient between the board and the ground and between the block and the board is μ = 0.2, g = 10m / S2 (1) The acceleration of the block and the board; (2) the speed of the block sliding away from the board
- 6. Zhang Jun students in "explore the size of friction more which factors." In the experiment of "exploring which factors are related to the size of friction force", Zhang Jun adopted the following experimental methods: put the long board on the horizontal table, and the wood (2) does the long board have to move in a uniform and straight line in the experiment I'm sorry I can't upload the picture, but please make sure to analyze it for me
- 7. Find a board about 1m long, put the board on the horizontal desktop, and pad a few round pencils under it, so that the friction between the board and the desktop is as small as possible What will happen if you find a toy car with batteries and drive it on the board?
- 8. As shown in the figure, in the experiment of studying friction, a small wooden block placed on the horizontal table is pulled horizontally with a spring scale each time, and the reading of the small wooden block's movement is shown in the following table (the contact surface between the wooden block and the table is the same each time): then from the table, we can see () & nbsp; the number of experiments, the movement state of the small wooden block, and the reading of the spring scale (n) 1 static 0.4 2 static 0.6 3 Acceleration 0.7 4 constant speed 0.5 5 deceleration 0.3 A. The maximum friction force on the block is 0.7nb. The maximum static friction force on the block may be 0.5nc. In the five experiments, the friction force on the block is the same three times. D. in the five experiments, the friction force on the block is the same two times
- 9. When exploring the relationship between acceleration, force and mass, why should we balance the friction, and why can we balance the friction by raising one end of the board
- 10. As shown in the figure, under the action of horizontal thrust F, the object a moves to the position in figure a at a constant speed. In this process, the pressure of a on the table will decrease, and the pressure of a on the table will decrease The pressure on the table will increase
- 11. The ratio of lucky money for Party A and Party B is 4:3, and the ratio of money spent is 18:13. At this time, they all have 36 yuan left. How much did Party A and Party B have? Who gives me the wrong answer, I will not live First come first score ~ answer the correct plus score within five minutes!
- 12. 73,
- 13. My height is 1.56cm, weight 58kg is very fat? How many jin do I need to lose
- 14. How to answer the second question on page 59 of mathematics in grade 4 of primary school
- 15. There are a group of chickens and rabbits. The total number of legs is more than twice the total number of heads. How many rabbits are there?
- 16. What is exercise 1 in mathematics book p16-17 3. As shown in the figure, Xiaohong wants to measure the height of the big tree 30m away from A. she stands at a and looks up at the top of the tree B, with an elevation of 30 ° (i.e. ∠ BDE = 30 °). Given that Xiaohong is 1.52m tall, she can calculate the height of the big tree (the result is accurate to 0.1M)
- 17. Is the product of two odd numbers prime or even
- 18. How to do the second sub question of question 9 on page 89 of the mathematics book of the sixth grade volume I of the people's education press?
- 19. A measuring cylinder, containing 300 ml of water, put three steel balls with equal radius, and the water surface rises to 360 ml If the water surface rises to 500ml, how many such steel balls will be in the measuring cylinder?
- 20. Shanghai Grade 8 Volume 2 physics knowledge points The first chapter is machinery and work The second chapter is heat and energy Just these two chapters The trial edition of Education Press