Is the product of two odd numbers prime or even
It is neither prime nor even
Since it already contains two odd numbers as factors, it does not conform to the definition of prime number
If it is an even number, it must be divisible by 2. If the factor of 2 appears from the product of two odd numbers, then it is obviously impossible to multiply both odd numbers, so it is not even
RELATED INFORMATIONS
- 1. What is exercise 1 in mathematics book p16-17 3. As shown in the figure, Xiaohong wants to measure the height of the big tree 30m away from A. she stands at a and looks up at the top of the tree B, with an elevation of 30 ° (i.e. ∠ BDE = 30 °). Given that Xiaohong is 1.52m tall, she can calculate the height of the big tree (the result is accurate to 0.1M)
- 2. There are a group of chickens and rabbits. The total number of legs is more than twice the total number of heads. How many rabbits are there?
- 3. How to answer the second question on page 59 of mathematics in grade 4 of primary school
- 4. My height is 1.56cm, weight 58kg is very fat? How many jin do I need to lose
- 5. 73,
- 6. The ratio of lucky money for Party A and Party B is 4:3, and the ratio of money spent is 18:13. At this time, they all have 36 yuan left. How much did Party A and Party B have? Who gives me the wrong answer, I will not live First come first score ~ answer the correct plus score within five minutes!
- 7. On the formula of quadratic function
- 8. During the promotion period of a shopping mall, it is stipulated that all goods in the shopping mall are sold at 80% of the price. At the same time, when customers spend a certain amount of money in the shopping mall, they can get the corresponding amount of lottery tickets according to the following scheme. (lottery shopping no longer enjoys preferential treatment) the range of consumption amount x (yuan) 200 ≤ x < 400 ≤ x < 500 ≤ x < 700 The amount of lottery ticket (yuan) 30 60 100 According to the above promotion method, customers can get double discounts when shopping in the mall. If Mr. Hu gets a discount of 120 yuan when buying a household appliance in the mall, the price of the appliance is______ Yuan
- 9. (1.29+1.37+1.45+.+1.85)/(1.47+2*0.84)≈( ) Remember: keep two decimal places!
- 10. The original price of a washing machine is 1450 yuan. Now it is sold at a 20% discount, but the price is still higher than the cost. 19. How much is the cost of this washing machine?
- 11. How to do the second sub question of question 9 on page 89 of the mathematics book of the sixth grade volume I of the people's education press?
- 12. A measuring cylinder, containing 300 ml of water, put three steel balls with equal radius, and the water surface rises to 360 ml If the water surface rises to 500ml, how many such steel balls will be in the measuring cylinder?
- 13. Shanghai Grade 8 Volume 2 physics knowledge points The first chapter is machinery and work The second chapter is heat and energy Just these two chapters The trial edition of Education Press
- 14. A 500N object is still on the horizontal ground, and the pressure on the ground is 0______ N. If the object is subjected to 100N vertical upward tension, the pressure on the ground is______ N. If the object is placed on an inclined plane, the pressure on the inclined plane will decrease______ 500N (fill in "greater than", "equal to" or "less than")
- 15. Under the action of horizontal tension f = 100N, the object with weight g = 500N slides along the horizontal ground at a uniform speed 1. If the horizontal pulling force is suddenly removed, find the sliding friction F when the pulling force is removed 2. If the gravity of the object is increased by 100N, in order to keep the object moving in a uniform and straight line, what is the horizontal tension f '?
- 16. There is a 100N object on the rough horizontal ground, which moves forward at a constant speed of 10m in 10s with 20n horizontal tension A. The power of gravity is 100wb. The power of supporting force is 100wc. The power of pulling force is 200wd. The power of pulling force is 20W
- 17. Xiao Zhang uses a horizontal pull force of 30n to lift an object with a weight of 100N and make it move 5m horizontally. After that, the pull force does work J and the gravity does work J The explanation of gravity work,
- 18. When an object weighing 100N is pulled horizontally to the right by 20n and moves horizontally to the right at a constant speed for 5m, the work done by the pulling force is______ J. What does gravity do______ J. What is the resistance to an object______ N. Direction______ .
- 19. If someone pulls a 100N object forward 5m on the horizontal ground with a 50N horizontal pulling force, the work done by the pulling force on the object is () the work done by gravity on the object ( Big brothers and sisters, help to solve this problem
- 20. When an object moves eastward at a speed of 5 m / s for 6 m / s, and northward at a speed of 3 M / s for 4 S, the velocity of the object in the 10 s is the same What is the average speed.