2. Three workshops in a factory 180 people. The number of people in the second workshop is three times that in the first workshop, 1 person is more. The number of people in the third workshop is half of that in the first workshop, and 1 person is even less. How many people are in each of the three workshops?

3.5 9s are added, subtracted, multiplied and divided, which is equal to 2 1. (Parentheses can be used) 9999 = 2 1

4. Eight eights divided by addition, subtraction, multiplication and division is equal to 1999. . (Parentheses can be used)

8 8 8 8 8 8 8 8= 1999

5,1,2, 5,13, 34, 89, (), () 6. Arrange 2004 squares in a row, and three children, A, B and C, take turns to dye them in turn. From the first one, A dyes one square red, B dyes two squares yellow, C dyes three squares blue, A dyes four squares red, B dyes five squares yellow and C dyes six squares blue … until all the squares are dyed. How many squares are dyed blue?

7.95 students form a rectangle to do problems, and the number of rows and columns is greater than 1. * * * How many arrangements are there?

8. Write several consecutive natural numbers so that their sum is 1680.

9. Divide the average values of the eight books 40, 44, 45, 63, 75, 78, 99 and 105 into two groups, so that the products of the four numbers in the two groups are equal.

10, 60 students line up for sightseeing in groups, with the same number of students in each group, no less than 6 and no more than 15. How many ways are there? How to divide it?

1 1, there is a rectangle, its length, width and height are three consecutive probability numbers, and its volume is 3360 cubic centimeters. What is its surface area?

12. Divide the nine numbers 30, 33, 42, 52, 65, 66, 67, 78, 105 into three groups, and write these three groups of numbers.

13, the number a is 9 greater than the number b, and the product of the two numbers is 792. What are the numbers A and B respectively?

14. The product of four consecutive odd numbers is 19305. What are these four odd numbers?

15. There are four children, one of whom is just older than the other 1 year. The age product of four children is 3204. How old is the oldest of these four children?

16. There are three natural numbers, A, B and C. Given that A× B = 30, B× C = 35, C× A = 42, what is the product of a×b×c?

17, a bunch of watermelons, sold the total of 1/4 and 5 for the first time, and the remaining 1/2 and 4 were sold for the second time, leaving 4. How many watermelons are there in this pile?

18. There are 780 students in Grade 5 and 6 in Jinxi Primary School. Among the students who go to the Mathematics Olympic School, 8/ 17 are fifth-grade students and 9/23 are sixth-grade students. So how many students in grades five and six are not from the Austrian school?

19, the circumference of a circle is 1.26 meters, and two ants start from both ends of a diameter at the same time and crawl along the circle. These two ants crawl 0.04m and 0.05m per second, respectively, and turn and crawl once every 1, 3s, 5s (consecutive odd numbers). Then, when they met, they had climbed for two seconds.

20. If six digits 1992□□ can be divisible by 105, then this six digits is ().

10 1. 10 The waste paper actually collected by the environmental protection team is equivalent to the planned 130%. /kloc-how much more waste paper did the environmental protection team actually collect than planned in October?

102, there is such a story in ancient Russia. A flock of geese are flying, and another goose meets them and cries, Hello! 100 goose. The leading goose replied: No, we are not 100. If you add 65,438+000%, 50% of the original group and 25% of the original group, your final 65,438+000 will be enough. Tell me: How much do we have now?

103, the sum of a and b is 187%. If the decimal point of b is shifted to the right by one place, then a and b are equal. What are the first numbers a and b?

104, a fruit shop sold two batches of grapes, and the money they sold was 4200 yuan. Compared with the original price, the first batch earned 25% and the second batch lost 25%. The boss said: I have been busy for more than half a month, and the money I earned and the money I lost just offset. It's really a waste of time. Please calculate and make sure that the boss is right.

105. The bookstore sent a children's story book. Sold 30% on the first day. The second day sold 120% of the first day. The next day, I sold 30 more books than the first day. How many children's story books did you get from the bookstore?

106, Xiaoqing's walking time from home to school was reduced from 10 minutes to 8 minutes. How many percent has Xiaoqing's walking speed increased?

108, washing powder A is 50% more expensive than washing powder C, but 20% lighter than washing powder B, and washing powder B is 50% heavier than washing powder C, but 25% more expensive than washing powder A ... These three kinds of washing powders are as good in quality, but the packaging effect is different. If you buy washing powder, which washing powder would you choose?

109. Miss Li wants to buy a laptop. He visited two computer stores, A and B. The price of the same brand computer he wanted to buy was 9980 yuan, but the discount methods of the two stores were different. Store A: 10% discount for the whole audience, and Store B: full shopping 1000 yuan 1000 yuan. Which laptop is cheaper?

1 10, both parties have deposits. Now Party A and Party B each withdraw 20% of their deposits, some of which are less than Party B's by 400 yuan. You should know that the total amount of money in their bankbooks at this time is14,400 yuan. It turns out that how much money does A and B have in their deposits?

1 1 1, 1 and 50-cent coins ***26, with a median of 8 cents in 5 yuan. How many coins are there in 1 5?

1 12. There are several parts. It takes 8 hours for Party A to do it alone, and it takes 12 hours for Party B to do it alone. Now B has been working alone for several hours because he has something to finish. * * * It took nine hours. How many hours did A do?

1 13, the distance between a and b16.5km. Xiao Qiang and Xiao Gang set out from A and B at the same time. Xiao Qiang stayed in B for 20 minutes, and then returned to A from B. Xiaogang stayed in A for 30 minutes, and then returned to B. Two hours later, they met on their way back. If Xiao Qiang walks1.2km per hour more than Xiaogang. What is everyone's speed?

1 14. A convoy transports 1800 glass bottles. According to the contract, the freight for each glass bottle is 0.9 yuan. If a glass bottle is damaged, it will not only pay the transportation fee, but also compensate 8 yuan. As a result, the freight is 1593.3 yuan. How many glass bottles were damaged during transportation?

1 15, chickens and rabbits are in the same cage, with 20 more chickens and 200 more rabbits. How many chickens and rabbits are there?

1 16. Spiders have eight legs, dragonflies have six legs and two wings, and cicadas have six legs and 1 wings. Now there are 25 of these three insects, *** 160 legs and 28 pairs of wings. How many kinds of these three insects are there?

1 17. Mother squirrel picks pine nuts. It can pick 40 every day in sunny days and 24 in rainy days, and it has picked 224 in a row. On average, 28 are collected every day. How many days has it rained these days?

1 18, a primary school held a math contest, *** 10 questions, and got 10 points for a correct answer, deducted 3 points for a wrong answer, 87 points for Xiao Ming, 74 points for Xiao Hua and 9 points for Xiao Hong. How many questions did the three of them answer correctly?

1 19, each set of colored stationery 19 yuan, each set of ordinary stationery 1 1 Yuan. I bought 16 sets of these two kinds of stationery, 280 yuan. How many sets of two kinds of stationery did you buy?

120, a primary school teacher and student *** 100 people went to plant trees. Each teacher planted 3 trees, while each student planted 1 tree and one * * * planted 100 tree. How many teachers and students are there?

12 1, 44 students went boating, 1 * * took the boat 10, including 6 people in the big boat and 4 people in the small boat. How many big boats and small boats are there?

122. Each bus needs 8 Class A parts and 3 Class B parts, and each bus needs 4 Class A parts and 10 Class B parts ... Today, * * * used 52 A parts and 79 B parts. How many buses are there in each of these two types?

123. There are 30 tractors of all sizes. Today, there are 122 hectares of arable land. Large tractors plow 5 hectares a day and small tractors plow 3 hectares a day. How many tractors are there?

124. A TV factory produces 500 TV sets every day. In the quality appraisal, 5 points will be deducted for each 1 set of qualified TV sets, and 0/8 points will be deducted for each 1 set of unqualified TV sets. If you get 993 1 minute in 4 days. How many qualified TV sets have been produced in 4 days?

125, a tour bus took fourth-grade students to Cuihua Mountain. Buy 99 tickets to 280 yuan, including one-way 2 yuan and round trip to 3 yuan. How many one-way tickets and round-trip tickets are there?