A batch of latest industrial dynamic information is input into the management storage network. A does it for 6 hours alone, B does it for 4 hours alone, A does it for 30 minutes first, and then A and B do it together. How long will it take A and B to finish the work together?
answer
It takes two hours for Party A and Party B to complete the work together, 12 minutes.
A train must cross the first and second iron bridges at a speed of 600 meters per minute. It takes five seconds longer to cross the second iron bridge than the first one, and it is known that the length of the second iron bridge is 50 meters shorter than twice that of the first one. Try to find out the length of the two iron bridges respectively.
answer
The length of the first iron bridge is100m, and the length of the second iron bridge is150m.
Jiangnan Eco-food Processing Factory has purchased a batch of mountain products, the quality of which is, according to the market demand, for rough processing and fine processing. It is known that the quality of refined mountain products is more than twice that of roughing, and the quality of roughing mountain products is better.
answer
2000 kg
The fifth grade elementary school next volume mathematics class hour training answer! shuan le
The second volume of the fifth grade math book in primary school has 48 pages and 49 pages of answers. Example 9 Answer: Less than sign. Try it: 9 out of 25 and 5 out of 6 are decimal.
9/25 = 9 ÷ 25 = 0.36 5/6 = 5 ÷ 6 ≈ 0.833
Example 10: 0.3 = 65438+3 divided by 00, 0. 13= 100 divided by 13, 0.2 13= 1000 divided by 2/kloc.
Exercise: Compare the size of two numbers in each principal. 7 in 10 is equal to the sign, 4 in 0.45 and 9 is greater than the sign, and 2 and 0.68 in 3 are less than the sign. . . Exercise 9
1, turn the false fraction into an integer. 12=4 2 10=5 15 15 = 13 52=4 9 54=6 7 1=7.。 . . Question 2: 1, 7/3 = 2 and 1/2, 1 1= 1 and 5/6.
3. Turn the match-fixing score into a belt score. . 1 1=5 and 1, 18=3 and 3/5, 19=2 and 5/7 (alas! It's too much trouble to call. . . . Ask me, make friends first. Is it this version? Otherwise, everything is in vain ...)
The second volume of mathematics in the fifth grade of primary school, Improving Primary School, is 4 1~47 pages, and the answer is urgent ~ the children do it themselves = =
The fifth grade elementary school mathematics exercise book, volume 2, page 30. What workbook are you? Wouldn't it be better to ask your classmates directly? I can tell you that you can't find a satisfactory answer here.
So if you want to copy, go directly to your classmates.
In the fifth grade of primary school, I practice two volumes of mathematics p57~60 every day. When selecting samples, the following statement is incorrect ().
A. the selected sample must be large enough. B. the selected samples shall be generally representative.
C. the selected samples can be selected according to your own preferences. Just increasing the number of investigators may not necessarily improve the quality of the survey.
Answer c
Among the following surveys, the one suitable for census is ().
A. ratings of news broadcast TV programs
B. The number of primary and middle school students in China who like math classes.
C. Service life of a batch of light bulbs
D. the weight of class one students
Answer d
The hotel has 100 identical rooms. After running for a period of time, it is found that there is a relationship between room pricing and room occupancy rate as shown in the following table. According to this relationship, in order to maximize the income of rooms, the price of each room should be ().
House price (RMB)
Occupancy rate
300 yuan 280 yuan 260 yuan 220 yuan
Answer c
What are the answers on pages 82 and 83 of the second volume of mathematics in the fifth grade of primary school? Think for yourself, it will hurt you.
The new motive force of mathematics in the fifth grade of primary school is 3 1. The answer must be the topic.
Time study, newspaper counting, weekly counting, grade five, the second volume of the answer is scared, can we share it together? She was so naive, so was I. People who are crazy about love can do anything and say anything.
We found a small house near the school and lived together. I have decided to send her to graduate school, bought her a lot of books, and let her take the postgraduate entrance examination. Every day, we have classes together, attend classes together, eat in the canteen together, go out to work at night, and she waits for me at home. She bought discounted fruits, peeled them one by one and cut them into pieces for me to eat. She also learned to cook with a honeycomb briquet stove for the first time ... I know that she loves me so much, and I am devoted to her. It is said that love costs the most, but I didn't spend much money and sent 300 yuan more to my family. She said it was for my sister to buy new clothes, so that we could have the cheapest food this month. She talked about me at home, and both parents asked to meet. I was fully prepared, but I was shocked by their family. Her family lives in a very high-end duplex house with luxurious decoration. Her mother said that because she is an only child, she hopes to live together after marriage. Her father has been frowning and looking at my worn jeans and old shirts. I think this contrast between the rich and the poor is too much like a scene in a movie or a novel, which is really hard to accept. I can't forget what her father said to me: my family Nannan has never suffered anything since she was a child, nor has she been wronged. This is the responsibility of our parents. Young man, can you do it? I didn't answer. I know I can't do it. At the same time, I also know that she wants to be with me