There are several chickens and rabbits in the cage. It is known that there are 28 heads and 86 legs. How many chickens and rabbits are there?

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• 1. There are 12 heads and 40 feet in the same cage. How many chickens and rabbits are there in the cage?
• 2. There are 1400 tons of grain in warehouse A and warehouse B. warehouse a transports 12.5% of the grain in this warehouse, and warehouse B transports 100 tons. Now the two warehouses store the same amount of grain. How many tons of grain did warehouse a store?
• 3. 9999×9999×19999．
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• 5. Fill in 3, 6, 9, 12, 15, 18, 21, 24, 27 in the appropriate box, so that the sum of the three numbers in each horizontal, vertical, and oblique row is 45
• 6. The C + + program for finding the first 20 items of Fibonacci sequence is written by recursion. Fibonacci sequence is: 1,1,2,3,5,8,13,21 From the third
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• 8. A math problem: a stands for a number, - a stands for what? - a must be negative? Brothers and sisters I have to do junior high school problems Sobbing
• 9. Xiao Hong read a story book. On the first day, she read 1 / 3 of the whole book. On the second day, she read the remaining 1 / 3 of the whole book. She still had a few parts of the book to read
• 10. A passenger train and a freight train leave from the two places at the same time. After four hours of meeting, it takes seven hours for the passenger train to complete the whole journey, and 60 kilometers for the freight train per hour, two times
• 11. [math problem 2] chicken and rabbit are in the same cage. There are 100 legs of chicken and rabbit. If you change chicken into rabbit and rabbit into chicken, there are 86 legs. How many chickens and rabbits are there? Please use arithmetic. Or use the equation of degree 1, One more question: The Wutong tree planting tree, willow and poplar trees, 1800, planting trees, two more than willow, is 55% of Wutong tree, how many trees planted?
• 12. In a cage, there are chickens and rabbits. Count their feet. There are 20 in total. How many chickens and rabbits are there in the cage?
• 13. Chicken and rabbit in the same cage problem: there are a group of chickens and rabbits, the total number of legs is 2 times more than the total number of heads, 18, to find the number of rabbits Just tell me the formula and the solution
• 14. 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?
• 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. 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?
• 17. There are 56 workers in the Oriental wood factory There are 56 workers in Dongfang woodwork factory, each of whom can process 10 desks or 15 chairs per day on average. This factory has received a batch of tasks of processing desks and chairs, and requires one desk and two chairs to be matched into one set. To complete the task in the shortest time, how to arrange the number of workers (solve the equation) to process desks and chairs? Do not use the incomprehensible ones, or the fraction of them to solve the equation,
• 18. 1+1=?+5=?+56=?*798=?
• 19. 1. If (X-2) (2 of X + ax + b) contains no quadratic term, and the coefficient of the first term is - 3, find a and B 2. Given that the square 2 of (x + 2y-1) + | 2x-y-2 | 2 = 0, find the value of the square 2 of 4 (2x-y) - 2 (2x-y) (2x + y) + 1 / 4 (2x + y)
• 20. Simple calculation: 39 / 38 times 37 is equal to? Please write down the process and give your ideas