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The new library is open. Xiao Hong goes to the library every three days and Xiao Ling goes every four days. After Xiao Hong and Xiao Ling meet in the library one day, they may meet again in the library after () days A. 7B. 12C. 8
3 and 4 are coprime, so the least common multiple of 3 and 4 is their product: 3 × 4 = 12 (days); a: after 12 days, they may meet again in the library
From the classroom to the library, Xiao Ming has to walk 1.4 minutes, Xiao Wang has to walk 1.30-7 minutes, Xiao Li has to walk 1.7-3 minutes. Who can walk fast? Why?
Xiao Li is quick, because one and thirty seven minutes is about 1.23 minutes, and one and seven three minutes is about 0.7 minutes
Xiao Ming, Xiao Li and Xiao Jun go to the library to borrow books. Xiao Ming goes to the library every three days, Xiao Li every five days and Xiao Jun every six days. The three of them go to borrow books together on May 20. What's the next time they go to the library at the same time
June 19 [3,5,6] = 30, because may has 31 days, 31-20 = 11 (days)
June + (30-11) = June 19
What is the sum of the reciprocal of 12 and the reciprocal of 6 / 7?
1/12+1/(6/7)=1/12+7/6=15/12=5/4
5x-4y is equal to 0, and X is proportional to y
5X-4Y=0
5X=4Y
X/Y=4/5
So x is proportional to y
If x * y = 1
X=1/y
This x is inversely proportional to y
If a is equal to one of minus B, then AB is to the power of 2011
If: a = 1 / b
Then: both sides of the equation are multiplied by B to get: a * b = 1
So the 2011 power of AB is the 2011 power of 1, and the result is still 1
Is x of x a fraction
Is x of x a fraction or not? Why do some people say it is? Is it a fraction or the simplest fraction?
The denominator of a fraction cannot be zero, X ≠ 0, X is the fraction. The most reduced fraction is that it can not be simplified. When x = 1, it is the most reduced fraction, and it is not in other times
Given the vertex of parabola y = - x ^ 2 + MX + N-N ^ 2 on parabola y = 4x ^ 2 + 4x + 19 / 12, find the value of real number m, n!
Using the analytic formula of parabola vertex, we can find the vertex of y = - x ^ 2 + MX + N-N ^ 2
Then, replace the vertex coordinates into y = 4x ^ 2 + 4x + 19 / 12
Finding the number of zeros of the function f (x) = 2 ^ x + X-1 is a concrete process
Obviously, f (x) = 2 ^ x + X-1 is an increasing function on R,
When x tends to negative infinity, f (x) also tends to negative infinity, and when x tends to positive infinity, f (x) also tends to positive infinity,
Therefore, there is exactly one zero point of F (x)
About x ^ 2-3 / 2x ^ 3-6x
1/2x
RELATED INFORMATIONS
- 1. Xiaojun, Xiaoli and Xiaoming do their homework. Xiaojun uses three tenths of an hour more than Xiaoli, and Xiaoming uses one tenth of an hour less than Xiaoli How long is the difference? If Xiaoming uses one tenth of an hour more than Xiaoli, how long is the difference between Xiaojun and Xiaoming?
- 2. In the long jump competition, Xiao Ming jumped 3 meters, Xiao Ming's 56 is equal to Xiao Jun's, Xiao Li's 45. How many meters did Xiao Jun and Xiao Li jump?
- 3. Xiaojun walks about 72 meters per minute. It takes him about 6 minutes to walk from his home to the library. How far is his home from the library?
- 4. Xiaolan's watch is three minutes fast and Xiaojun's watch is three minutes slow. They all arrive at school at 7:30 by their own watch. Who will arrive first?
- 5. Xiao Ming and Xiao Li walk from village a to village B at the same time. Xiao Li's speed is 4 kilometers per hour, Xiao Ming's speed is 5 kilometers per hour. Xiao Li arrives 15 minutes later than Xiao Ming Xiao Ming and Xiao Li walk from village a to village B at the same time. Xiao Li's speed is 4 kilometers per hour, Xiao Ming's speed is 5 kilometers per hour. Xiao Li arrives 15 minutes later than Xiao Ming. Ask for the distance between village a and village B
- 6. The distance between the school and the library is 18 kilometers. It took Xiao Ming 5 / 8 hours to get there, while Xiao Li 7 / 12 hours. Who is faster
- 7. Xiao Li borrowed a book from the library. It has 132 pages in total. After reading it for five days, there are 72 pages left. How many pages do you need to read every day on average? If you can only borrow it for nine days, how many pages do you need to read from the sixth day
- 8. Xiao Li borrowed a copy of space exploration from the library, with a total of 132 pages. After 356 days, there were 72 pages left. How many pages did she read every day? How many days did she read every day?
- 9. Xiao Ming and Xiao Li move from village a to village B at the same time. Xiao Li's speed is 4 km / h, Xiao Ming's speed is 5 km / h. Xiao Li arrives 15 minutes later than Xiao Ming To find the distance between villages a and B, it is best to use the equation,
- 10. Xiao Li has measured that her normal average speed is 1.2 meters per second, how many kilometers per hour
- 11. The new library is open. Xiao Hong goes to the library every three days and Xiao Ling goes every four days. After Xiao Hong and Xiao Ling meet in the library one day, they may meet again in the library after () days A. 7B. 12C. 8
- 12. Do you go to the library to read in the evening? Do you go to the Spring Festival party in the evening
- 13. We go to the cinema on Sunday, and we go swimming on Sunday
- 14. Let's go to the cinema together on Sunday, () you come to ask me out, () I'll ask you out
- 15. The product of 1997 times 0.3 divided by 1999 times 0.5 plus the product of 1.2 divided by 1999 is calculated by a simple method
- 16. Compare 11 out of 27 with 7 out of 18
- 17. 7 / 12 + 5 / 7-7 / 12 + 5 / 7 = simple calculation The process should be detailed
- 18. If x = 111980 + 11981 +11997, then the integral part of X is______ ．
- 19. Which country has 96000 square kilometers of land?
- 20. The parabola ax & # 178; + BX + C passes through points (0, - 1) and points (3,2). A < 0, the vertex is on the straight line y = 3x – 3. Find the analytic expression of the function