① 1993× 1994 1994+ 1994× 1993 1993 ② 19.58×66+22×9 1.26

2. One pen can be exchanged for three ballpoint pens, and four ballpoint pens can be exchanged for seven pencils, so four pens can be exchanged for () pencils.

3. Two people A and B, who are 260 kilometers apart, travel in opposite directions along a straight road at the same time, heading for B and A respectively. A driving 32 kilometers per hour. B travels 48 kilometers per hour. Party A and Party B each have a walkie-talkie. When the distance between them is less than or equal to 20 kilometers, they can contact each other through walkie-talkies. Q:

(1) How soon can two people start to communicate with each other by walkie-talkie?

(2) How long did it take them to meet after they contacted each other by walkie-talkie?

(3) How long can they contact each other on the walkie-talkie?

Next March 1 is Thursday, so next year's National Day is a week.

5. There are 40 consecutive natural numbers, and the maximum number is four times the minimum number, so the sum of the maximum number and the minimum number is _ _ _ _ _ _ _.

6. Three kittens went fishing. They caught 36 fish. Among them, the number of fish caught by black cats and flower cats is five times that of white cats, and the number of fish caught by flower cats is two times less than that of the other two cats, with nine fewer fish. A black cat can catch _ _ _ _ fish.

7. In the formula shown below, if the numbers in the seven squares are different from each other, then the maximum sum is _ _ _ _ _. ( 176)

8. Arrange several natural numbers starting from 1 into the shape shown in the figure above. So, the second number from the left in line 25 is.

9. On Sunday morning, Xiaoming found that the alarm clock had stopped because the battery was dead. He installed a new battery, estimated the time and set the hands of the alarm clock to 8 o'clock. Then, Xiaoming left home and went to the planetarium. Xiaoming arrived at the planetarium and saw that the standard clock of the planetarium showed 9: 15. An hour and a half later, Xiao Ming returned home from the planetarium at the same speed. The time to see the alarm clock is 1 1: 20. When should Xiaoming set the alarm clock accurately? time division

10. Teacher Zhang is three times as old as Bing Wang and four years younger. Teacher Zhang's age seven years ago is the same as that of Wang Bing nine years later. How old are Teacher Zhang and Bing Wang?

1 1, car A and car B leave from A and B at the same time, meet after 4 hours, and car A will walk to B for another 3 hours. It is known that car A is 20 kilometers faster than car B every hour. How many kilometers is it between A and B?

12, 54 people in the class went boating, and one * * * took a boat on 10, including 6 people in the big boat and 4 people in the small boat. How many ships are there?

1. Simple calculation:

13 4.36× 12+88×4.36

14 14. 15+ 12.04×99-2. 1 1

15 7. 1×399.08

16 75×4.67+ 19.9×2.5

17 2005 65438+ 10/is Saturday. What day is Children's Day this year?

Quotient 18 4÷ 1 1 What is the 2008th place after the decimal point?

What is the sum of 19 8÷ 1 1 quotient after the decimal point?

20. Move the decimal point of a number one place to the left, and then add it to this number, and the number is 17.27. What is the number?

2 1. If the decimal point of a number is moved one place to the right, the value is 86.4 larger than the original value. What is the original number?

22. Complement the decimal point in the incomplete number sum product in the multiplication formula.

□.□□

×□ 2.□

□ □ □

□□□ □

__□ 8□

□□ 9□ 2 □

The sum of the ages of A, B and C is 1 13 years old. When A is half the age of B, C is 38 years old. When B is half the age of C, A is 17 years old. So how old is B now?

1、65432 1×909090+65432 1×909092

2. It is known that the big square is more than 4 cm longer than the small square, and the big square is 96 cm larger than the small square. What are the areas of the big square and the small square?

3. Warehouse A stores 65,438+008 tons of grain, and Warehouse B stores 65,438+040 tons of grain. How many tons must be transported from warehouse B to warehouse A in order to make the amount of grain stored in warehouse A reach three times that of warehouse B?

Lixin Primary School held a sports meeting. The number of people who take part in the race is four times that of those who take part in the long jump, and 66 more than those who take part in the long jump. How many people took part in the race and how many people took part in the long jump?

5, chickens and rabbits in the same cage, *** 100, 320 feet, then, how many chickens and rabbits are there?

6. Xiaoming is 2 years old and his mother is 26 years old. So, how many years later, her mother is three times as old as Xiao Ming?

The police questioned three suspicious people, one of whom was a thief, and told all the lies. A person is an accessory, whether his words are true or not. The other man is a good man, and every word is true. When asked about the occupations of the three people in the query, the answer is:

A: I'm a salesman, B is a driver and C is a graphic designer.

B: I'm a doctor, and C is a shop assistant in a department store. Ah, if you ask him, he will definitely say that he is a salesman.

C: I'm a shop assistant in a department store. A is a graphic designer and B is a driver.

Excuse me, who is the thief who tells lies among these three people?

8. Xiao Zhang, Xiao Wang and Xiao Li practice basketball. A * * * voted 100 times and missed 43 times. It is known that Xiao Zhang and Xiao Wang voted 32 times, Xiao Wang and Xiao Li voted 46 times, and how many times did Xiao Wang vote?

9. There are five different Chinese books, six math books, three English books and two nature books. How many ways can you choose one of them?

10, move bricks for the school like Lei Feng Tuan. If everyone moves 18, there are 2 pieces left; If everyone moves 20 yuan, a classmate will have no bricks to move. * * * How many bricks are there

1 1, and the distance between port a and port b is 360 kilometers. It takes 35 hours for a ship to travel back and forth between two ports, and it takes 5 hours more to sail against the current than against the current. At present, there is a sailboat with a speed of 12 km per hour. How many hours does it take for this motorized sailboat to go back and forth between Hong Kong and Guangdong?

12. It took the train 23 seconds to pass through the 342m tunnel, and then it took 17 seconds to pass through the 234m tunnel. This train missed another train with a length of 88 meters and a speed of 22 meters per second, and asked for several seconds.