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Xiao Ming's family hung up a clock and struck it twice an hour: at what time and in half an hour. Think about it, how many times does this clock strike in a day and a night?
2×（1+2+3+… +12 + 12) = 2 × (1 + 12) × 122 + 24 = 180
When does Mingming's clock strike? How many times does it strike in half an hour? How many times does it ring from 1:00 to 3:00
It's 1:30. Thank you very much
After a day and night, the minute hand of the clock just went () turns
A. 12B. 20C. 24
After a day and a night, the minute hand of the clock has just gone 24 turns
The minute tip of a clock is 25.12 cm. How long is the minute of this clock
25.12=2πr
The solution is r = 4cm
The minute hand on a clock goes () round the clock day and night
A. 12B. 24C. 60D. 1440
24 △ 1 = 24 (circle), so B
When the clock goes for one hour and 45 minutes, what is the angle of the minutes
At that time, when the clock went for an hour, the angle of the minute was 360 degrees
At that time, the clock walked for 45 minutes, then the angle of the minutes was: 360 °× (45 / 60) = 360 °× 3 / 4 = 270 °
When the clock runs for one hour and 45 minutes, the angle of minutes is 360 ° + 270 ° = 630 °
The clock strikes at every hour, once at half hour, and () times in a day and night
A. 180B. 156C. 178D. 150
2 (1 + 2 + 3 +) +12 + 12) = 2 × (1 + 12) × 122 + 24 = 180
The clock is at every integral point. It doesn't strike at half an hour. It strikes () times in a day and night
I'll give you any score (within 120 points)
The clock is at every integral point. It doesn't strike at half an hour. It strikes (48) times in a day and night
The clock strikes at every hour, once at half hour, and () times in a day and night
A. 180B. 156C. 178D. 150
2 (1 + 2 + 3 +) +12 + 12) = 2 × (1 + 12) × 122 + 24 = 180
The number of times a clock strikes on the hour is the number of times the clock counts. It strikes once every half an hour. How many times a day and night?
[（1+2+3…… +12）+12]×2
＝〔（1+12）×12÷2+12〕×2
＝〔78+12〕×2
＝90×2
＝180
A: 180 shots a day and a night
Do you understand? Good luck. Goodbye
＝180
RELATED INFORMATIONS
- 1. If the clock strikes at every hour, the number of times it strikes is equal to the number of the clock points, and it strikes at every half hour, then the clock strikes day and night______ Next
- 2. The length of the hour hand of a clock is 14 cm. After a day and a night, how many cm is the distance that the point of the hour hand passes
- 3. When is the first time that the hour hand and the minute hand coincide?
- 4. The conclusion of the experiment of measuring the acceleration of the car with the clock
- 5. A question about using the successive difference method to calculate acceleration Can I use a = (x6 + X4 + x2-x5-x3-x1) / 3t2 to calculate the acceleration? Can I use all the data?
- 6. For a two digit number, its ten digit number plus seven times of the one digit number is still equal to the two digit number. Such a two digit number has () A. One B. two C. three D. four
- 7. Xiao Ming's wall clock is slow every hour. At 8 a.m., Xiao Ming sets the clock at the standard time. At 12 noon, what's the standard time?
- 8. Xiao Ming and his father go to the park to play. Xiao Ming wants to make a plane. Today is children's day. Xiao Ming has half a ticket. His father paid 20 yuan in total and recovered 2 yuan. How much is the ticket price for Xiao Ming and his father
- 9. Xiao Gang has several pieces of RMB 5 yuan and RMB 2 yuan. She wants to take out 43 yuan. How many different ways are there? (list all the ways)
- 10. In Xiaogang's Bank, there are 20 2-cent and 5-cent coins, totaling 7.6 yuan. How many 2-cent coins are there?
- 11. (1) The figure formed by the minute hand of the clock rotating one circle is () (2) the line segment from () to () is called radius (3) The line segment that passes through () and () is called diameter (4). In the same circle, all radii () are equal, and () whose diameter is equal to radius is also equal. (5) use a compass to draw a circle with a diameter of 20cm, and the distance between the two feet of the compass is () cm. (6) a circle is a () figure, which has () axis of symmetry. (7) a square has () axis of symmetry, and a rectangle has () axis of symmetry（ ）(8) the circumference of a circle is () times of the diameter of the same circle. (9) the radius of a circular fish pond is 10 meters. If you walk around it once, you have to walk () meters. (10) the length of the hour hand of a wall clock is 5 cm, (11) when drawing a circle, the distance between the two feet of the compass is the circle () (12) the line segment with both ends on the circle, () is the longest. (13) the ratio of the radius to the diameter of the circle is () (14) the radius of the small circle is 6cm, the radius of the big circle is 9cm. The ratio of the diameter of the small circle to the diameter of the big circle is (), (15) the radius of the circle is 7 cm, its circumference is () cm, the diameter of the circle is 13 m, its circumference is () M. the circumference of the circle is 75.36 decimeters, its radius is () decimeters. (16) a wire hoop should be put on the outside of the cylindrical bucket with a bottom half diameter of 14 cm, and the joint part is 6 cm, Use wire () cm (17) to draw a circle with a compass. If the distance between the two feet of the compass is 6cm, the circumference of the circle drawn is () cm. (18) when drawing a circle, the fixed point is () cm. (19) the radius from the center of the circle to any point on the circle is () cm. (20) the circumference is () cm. (21) the diameter and length of the circle determine () cm
- 12. LAN LAN and Tian Tian fold a thousand paper cranes together. Lan Lan says to Tian Tian, "you fold 1 / 5 less than me." Tian Tian says to LAN LAN, "if you give me your 1 / 6, I'll have four more than you." please calculate how many thousand paper cranes LAN LAN has folded?
- 13. The charging standard of a local telephone is: 30 cents for the first five minutes, and 20 cents for every minute after that. Uncle Wang pays 2 yuan and 70 cents after a call, and he calls for () minutes at most?
- 14. This year, the age of father and daughter is 52 years old. Six years later, the age of father is three times that of daughter. What are the ages of father and daughter?
- 15. There are three people in the family. My father is three years older than my mother. Now the total age of the family is 80 years old. Ten years ago, the total age of the whole family was 51 years old. My daughter is now 80 years old______ I'm 40 years old
- 16. I want to ask some math questions Find the rules and fill in the numbers: 0, 3, 8, (), (), 35
- 17. Yesterday afternoon, Mr. Zhang assigned a math problem. In the evening, I racked my brains and couldn't figure out how to solve it, Fill in a poem My grandfather's 70th birthday is congratulated by all my relatives and friends. I wish my grandfather happiness and longevity. But my grandfather sighed () I'll stop him soon () grandfather, your body is stronger than young people!
- 18. If there are two ways to charge mobile phone: the first way, the user's monthly phone fee: 10 yuan monthly rent plus 0.4 call fee per minute; The second way, the user's monthly fee: 25 yuan per month plus 0.2 yuan per minute 1. How long is the call time per month, and how much is the call cost of the two modes? Due to business needs, boss Zhang calls no less than 3 hours a month. Please help him figure out which one is cost-effective
- 19. The following table shows the time difference between several cities and Beijing (the number with a plus sign indicates the time earlier than Beijing time at the same time) paris-7 Tokyo + 1 new york-14 If Beijing time is 8 p.m., what's Paris time? If it's 8:00 p.m. Beijing time and Xiao Ming is calling his friends in New York, do you think it's appropriate? There should be a formula
- 20. The charge standard of a taxi company is 6 yuan within a kilometer, and 1.2 yuan per kilometer for the part more than 3 kilometers (1 kilometer for less than 1 kilometer). Xiao Zhang has to go to a place 6.5 kilometers away, and he should pay if he rents the car of a company_____ element Company B doesn't charge the starting price. It should be paid outside 6.5________ element If he goes 9.6 kilometers away, should he choose car a or B?