His father's age is 9 times that of XiaoCong, and his mother's age is 7.5 times that of XiaoCong. His father is 6 years older than his mother, and XiaoCong is a child this year______ I'm 40 years old
Suppose XiaoCong is x years old, then: 9x-7.5x = 6, & nbsp; & nbsp; 1.5x = 6, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 4; a: XiaoCong is 4 years old, so the answer is: 4
RELATED INFORMATIONS
- 1. Xiao Li is 6 years old, and her father is 36 years old. How many years later, her father's age will be three times that of Xiao Li?
- 2. His father's age is 9 times that of XiaoCong, and his mother's age is 7.5 times that of XiaoCong. His father is 6 years older than his mother, and XiaoCong is a child this year______ I'm 40 years old
- 3. His father's age is 9 times that of XiaoCong, and his mother's age is 7.5 times that of XiaoCong. His father is 6 years older than his mother, and XiaoCong is a child this year______ I'm 40 years old
- 4. On this year's teacher's day, Xiao Hong made a semicircular greeting card for her teacher with colored cardboard. For the sake of beauty, she bought a rope to stick it on the outside of the card It took 41.12 meters of rope to make this card. How many square centimeters of cardboard did he use?
- 5. On teacher's day this year, Xiao Hong made a semicircle for her teacher with colored cardboard. In order to make it beautiful, he bought colored rope to glue it to the outside of the card, It took 41012cm long colored rope to make this card. How many square centimeters of colored cardboard did he use? The content is clear, neat and clear Wrong! It's 41.12cm
- 6. On teacher's day this year, Xiao Hong used color coated paper to make semicircular greeting cards, sharing 41.12cm long color rope. How many square centimeters of color cardboard did she use?
- 7. Xiaoming and Xiaoli play poker game 'calculate 24'. Each of them plays two cards. The four cards are 2, 2, 9 and 3. Please list two different calculation tests and help them calculate 24! How to calculate
- 8. Playing card game: Xiaoming's back to Xiaoliang, let Xiaoliang operate according to the following four steps: first, distribute the left, middle and right three piles of cards, each pile of cards is no less than two, and the number of each pile of cards is the same; second, take out two cards from the left pile and put them in the middle pile; third, take out one card from the right pile and put it in the middle pile; fourth, there are several cards in the left pile, Just take a few cards from the middle pile and put them into the left pile. At this time, Xiao Ming accurately says the number of cards in the middle pile. Do you think the number of cards in the middle pile is () I think it's difficult to solve this problem. It's estimated that it's the IQ reason T ^ t,
- 9. Playing card game: Xiao Ming's back to Xiao Liang, let Xiao Liang operate according to the following four steps: the first step & nbsp; distribute the left, middle and right three piles of cards, each pile has the same number of cards, and no less than two cards; the second step & nbsp; take out two cards from the left pile and put them in the middle pile; the third step & nbsp; take out one card from the right pile and put it in the middle pile; the fourth step & nbsp; There are several cards in the left pile, so take a few cards from the middle pile and put them into the left pile. At this time, Xiao Ming accurately said the current number of cards in the middle pile. What do you think is the current number of cards in the middle pile? Explain your reasons
- 10. Playing card game: Xiao Ming's back to Xiao Liang, let Xiao Liang operate according to the following four steps: the first step & nbsp; distribute the left, middle and right three piles of cards, each pile has the same number of cards, and no less than two cards; the second step & nbsp; take out two cards from the left pile and put them in the middle pile; the third step & nbsp; take out one card from the right pile and put it in the middle pile; the fourth step & nbsp; There are several cards in the left pile, so take a few cards from the middle pile and put them into the left pile. At this time, Xiao Ming accurately said the current number of cards in the middle pile. What do you think is the current number of cards in the middle pile? Explain your reasons
- 11. Xiao Li is 27 years younger than her mother, and her father is 4 years older than her mother. The total age of the three is 82. How old is Xiao Li this year?
- 12. Mom, dad and Xiao Li are 72 years old this year. Five years ago, they were 58 years old. How old is Xiao Li this year?
- 13. As the saying goes, "it's good to enjoy the cool under a big tree."
- 14. Why do you say "cool under a big tree"? What's the scientific reason?
- 15. Why do you say it's cool under a big tree? I hope in terms of biology
- 16. (Mudanjiang, 2013) as the saying goes, "it's good to enjoy the cool under a big tree", which shows that () A. Biological impact on the environment B. biological adaptation to the environment C. environmental change biology D. environmental restriction biology
- 17. Why is it good to enjoy the cool under the big tree? Explain from the physical point of view One of the points is that the evaporation of water on the surface of leaves needs to absorb heat and play a cooling role. Our teacher also said that it is related to air flow. I didn't hear it clearly. Please help me to explain the relationship between enjoying the cool under the big tree and air flow
- 18. Why is it so cool under a big tree?
- 19. Explain the reason of "a big tree is good for enjoying the cool under the ground" with physics knowledge Explain with the change of state of matter
- 20. Explain "cool under big tree" with physics knowledge Mainly speaking, not too much