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People's life is 80 years old, then the number of heart beats in a person's life is calculated, and the result is expressed by scientific counting method
It is generally believed that people have 72 beats per minute
If the leap year is ignored, 72 * 60 * 24 * 365 * 80 = 3027456000 = 3.027456 * 10 ^ 9
Fall entrance test of XRS 2008-2009 academic year
The price of cherries on the market this year is 50% higher than that of last year. This year's price per kilogram is m yuan, and last year's price per kilogram is () yuan
Because last year's price per kilogram was X
Then 150% x = m
3/2x=m
x=2/3 m
RELATED INFORMATIONS
- 1. Nanchong Xichong County 2008-2009 junior high school mathematics final test questions (including answers)
- 2. If (x + 3) (X-5) = the square of X + kx-15m, then the value of K-M is A、-3 B、5 C、-2 D、2
- 3. It is known that the square of Y and x plus 1 is in positive proportion, and when x = 2, y = 10, find the functional relationship between Y and X
- 4. It is known that y is positively proportional to the square of X, and when x = - 1, y = - 3 (1) is the functional relation between Y and X
- 5. If f [10x power] = x, then f [5] is equal to= Let 10 ^ x = t, then x = LGT That is, f (x) = lgx ((why can t be changed into x in LGT in this step?) So f (5) = lg5
- 6. If a is greater than 0 and the square B of a is greater than 0, then the third power of a is the square of B___ 0
- 7. How many natural numbers can't be divisible by any number 3, 5 or 8
- 8. Fill in the three boxes of the six digit number 3, 2, 1 so that the number can be divided by 15. The smallest of the six digits is______ ．
- 9. How many natural numbers from 1 to 1003 can't be divided by 7, 11 or 13?
- 10. A. B, C are three different prime numbers less than 20, a, B, C = 30, and a
- 11. 50 power of 0.25 × 10 power of 256 × 20 power of (- 2)
- 12. To the 10th power of 0.25 to the 20th power of x2
- 13. In the Mariana Trench in the Pacific Ocean with a depth of 1 × 10 m to the fourth power, scientists have found fish swimming. What is the pressure on these fish? P seawater = 1.03 × 10 to the third power, kg / m to the third power 10 kg per kilogram
- 14. The blood vessels that the heart "collects" blood back to the heart are. The "structure" that the heart pumps blood out is. The blood vessels that these two structures pump blood into are The blood vessels that the heart "collects" blood back to the heart are_ ,_ What is the structure of the heart that pumps blood out_ ,_ These two structures respectively pump blood into the blood vessels_ ,_
- 15. Heart pumping process
- 16. A person's heart rate is 75 / min, 80 ml of blood is delivered per beat, and his blood pressure (which can be regarded as the average pressure of blood delivered by the heart) is 15000 PA ① The average power of this person's heart beating ② How high does this person's heart work in a day equal to lifting a one ton object? Our teacher said that this problem should be constantly publicized and deformed. If I change to power P = pressure PSV, I won't be able to do so. It's troublesome for experts to give advice,
- 17. I visited the Great Wall, the Palace Museum, the terracotta warriors and horses of the first emperor of Qin Dynasty, the Nanjing Yangtze River Bridge and other places of interest?
- 18. The Great Wall, the Palace Museum and the Nanjing Yangtze River Bridge are historic sites for Chinese and foreign tourists
- 19. The Great Wall, the Forbidden City and the Nanjing Yangtze River Bridge are places of interest in China
- 20. Xiao Wang invited his cousin to visit Beijing during the summer vacation. At that time, he visited the Great Wall, the summer palace, the Forbidden City and so on The content is that Xiao Wang invited his cousin to visit Beijing during the summer vacation. At that time, he visited the Great Wall, the summer palace and the Forbidden City Write as many letters as you can