1. The students lined up to go to the movies. The queue is 600 meters long. Mr. Wang, who is at the front of the queue, walks to the end of the queue at a speed of 4 meters per second and gives Mr. Zhang a movie ticket. How many seconds does it take Mr. Wang to give the movie ticket to Mr. Wang?

600/(2+4)= 100 (seconds)

A: It takes 100 seconds for Mr. Wang to give the movie tickets to Mr. Wang.

2. The smallest even number divisible by 3, 1 1 at the same time is the least common multiple of (2,3, 1 1 66).

3.A and B are both natural numbers, the common divisor of A and B is only 1, and their minimum common multiple is (ab).

4. In a÷b, when A is an integer, B is an integer, and C is an integer without remainder, then A can be divisible by B. ..

The product of 5.29 and (1) is a prime number.

6. The product of17 and (2 and all natural numbers greater than 2) is a composite number.

The product of 7.23 and (6) (138) is divisible by 2 and 3 (by 6).

8. The product (570) of19 and (30) is divisible by 2, 3 and 5 (by 30);

A prime number within 9.20 is still a prime number after adding 2 (3,5, 1 1, 17,) and still a prime number after subtracting 2 (19,13,7,5).

10. The sum of two consecutive even numbers is 122. These two numbers are (60) and (62) respectively, (122/2=6 1 (intermediate number)). Their greatest common divisor is (2) and their least common multiple is (65438+).