There are 40 chickens and rabbits in the cage. The total number of chicken legs is 20 more than that of rabbit legs. How many chickens and rabbits are there respectively

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• 1. How to do the 12 questions on page 16 of the fourth grade mathematics volume II of PEP? It should be simple
• 2. How to write the third question on page 39 of supplementary exercises of mathematics in Volume 2 of grade 5 of Jiangsu Education Press Five trucks of cement, 30 bags each, were delivered from the construction site. If the cement is used up in six days, the average daily use of () bags, daily use of this batch of cement (fraction), is (fraction) of the car.
• 3. The fruit shop shipped 600 kg of apples, pears and oranges. The apples were 80 kg less than the pears, and the oranges were 20 kg more than the pears?
• 4. Known a quadratic function analytic formula: y = - 0.5x2 + 4x-3, find the symmetry axis and vertex coordinates of this function analytic formula (please write the process)!
• 5. A 2.5m long cuboid wood has a square bottom and a side length of 3DM. If the wood is said to be divided into three sections, how many square decimeters will the surface area increase? Tell me why
• 6. How many square decimeters has the surface area increased after sawing it into two sections? (fast) Respondent: 784252835 This responder, so that I can understand
• 7. How many square decimeters has the surface area increased after sawing it into two sections,
• 8. A cuboid wood is 4m long, 3DM wide and 3DM high. After sawing it into two sections, how many square decimeters has the surface area increased?
• 9. A rectangular piece of glass, 5 decimeters long, 3 decimeters wide, the remaining part is a square. Known cut area is 71 square decimeters, then the remaining square area is______ Square decimeter
• 10. There is a rectangle. If its width is reduced by 2 mm or its length is reduced by 3 DM, its area will be reduced by 24 square decimeters. What is the original area of this rectangle?
• 11. Unit 1 knowledge of mathematics in Grade 6 of PEP (Volume 1) It must be PEP! And it's about location
• 12. There are 15 small balls in black, white and red. Mix them in the bag, and at least several balls can be found out. In order to ensure that 6 balls are of the same color, at least 6 balls should be found out______ One
• 13. Rational number summary and problems in thinking 1. In the operation of rational number, the operation includes: addition (); the order of the mixed operation of multiplication () is () 2. In the mixed operation of multiplication and division, first () and determine (), and then (), so as to avoid mistakes in () operation. 3. In the addition and subtraction operation, the numbers whose sum is () or () are added respectively, which can simplify the operation and simplify the operation
• 14. A column of numbers 1, 3.5, 7, 9, 11, 13... So what's the 100th number Why? What's the law? It's 1, - 3. - 7, 11, - 13··· sorry
• 15. Seventh grade mathematics volume I p38 exercise 1.4, 4, 6,
• 16. (30 18:34:42) It is known that the first term A1 = 1, tolerance D is greater than 0, and the second term, the fifth term and the fourteenth term of an arithmetic sequence are the second term, the third term and the fourth term respectively (1) (2) let BN = 1 / N (an + 3) & # 160; (n belongs to n *), Sn = B1 + B2 + B3 + ·· BN to find SN  
• 17. In autumn, the grass in the field is still (), () like ()
• 18. Uncle Li raised 600 chickens and raised 1 / 5 more ducks. How many ducks does Uncle Li raise?
• 19. Articles about sunflowers It's not necessary to express one's ambition by describing the appearance and color. It's not too literary. It's just ordinary composition
• 20. What are the common factors of 42 and 49