![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
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)
Seven five and four two
Five five and nine two
Three five and fourteen two
One five and nineteen two
It's just like these four ways
There are two yuan RMB and five yuan RMB. There are 63 yuan RMB, a total of 171 yuan. How many are two yuan RMB? How many are five yuan RMB?
The number of RMB sheets of 2 yuan = (63 × 5-171) / (5-2) = 48
The number of RMB sheets of 5 yuan = (171-63 × 2) / (5-2) = 15
On Sunday, Xiao Ming and his mother set out from home and went to grandma's house together,
After they left for an hour, dad found that the gift he had brought to grandma was left at home, so he immediately took the gift with him and chased them at the speed of 6 kilometers per hour. If Xiao Ming and mom traveled 2 kilometers per hour, it would take 1 hour and 45 minutes from home to grandma's house. Q: can dad catch up with them before Xiao Ming and mom went to grandma's house?
It's 2 + 2 × (3 / 4) = 3.5km from home to grandma's house, so Xiao Ming and his mother can only walk 3.5km in one hour and 45 minutes
Dad can walk 6 × (3 / 4) = 4.5km in 45 minutes
So Dad can catch up with them
During the Spring Festival, Xiao Ming and his father went to grandma's home to pay New Year's respects. After they left for an hour, his mother found that they had brought a gift to grandma
During the Spring Festival, Xiao Ming and his father set out from home to pay a new year's visit to grandma's home. After an hour's walk, their mother found that she had left the gift at home. So she took the gift with her and chased them at the speed of 6km per hour. If Xiao Ming and his father traveled 2km per hour, it would take one hour and 45min to go from home to grandma's home. Could mother catch up with them before they went to grandma's home?
We need to use equations to solve it. Don't use linear equations of two variables
On the long holiday of May 1st, my brother and my mother set out from home to go to grandma's house together. After they left for an hour, my brother found that the gift he had brought to grandma was left at home, so he immediately took the gift with him and chased her at the speed of 6 kilometers per hour. If my brother and my mother traveled 2 kilometers per hour, it would take them 1 hour and 45 minutes to go from home to grandma's house. I asked my brother if he could take my brother and my mother to go to grandma's house Do you want to catch up with them?
Suppose that it takes x hours for a brother to catch up with his younger brother. From the meaning of the question: 6x = 2 + 2x, solving this equation: x = 12. The younger brother walked for 1 + 12 = 1 hour, 30 minutes < 1 hour, 45 minutes, and did not arrive at grandma's house. A: the elder brother can catch up
On the long holiday of May 1st, my brother and my mother set out from home to go to grandma's house together. After they left for an hour, my brother found that the gift he had brought to grandma was left at home, so he immediately took the gift with him and chased her at the speed of 6 kilometers per hour. If my brother and my mother traveled 2 kilometers per hour, it would take them 1 hour and 45 minutes to go from home to grandma's house. I asked my brother if he could take my brother and my mother to go to grandma's house Do you want to catch up with them?
Suppose that it takes x hours for a brother to catch up with his younger brother. From the meaning of the question: 6x = 2 + 2x, solving this equation: x = 12. The younger brother walked for 1 + 12 = 1 hour, 30 minutes < 1 hour, 45 minutes, and did not arrive at grandma's house. A: the elder brother can catch up
On Sunday, Xiao Ming and his mother set out from home to Xiao Ming's grandmother's house. They walked 5 kilometers an hour. After 20 minutes, his father found a gift for his grandmother at home
Forgot at home, he immediately took gifts to catch up with them at the speed of 8 kilometers per hour, and caught up with them on the way. How long did it take Xiao Ming's father to catch up with them?
If it takes x hours, Dad's distance should be equal to the sum of Xiao Ming's distance
, i.e
(20 minutes is 1 / 3 hour)
5*1/3+5x=8x
The solution is x = 5 / 9 (hours)
On the long holiday of May 1st, my brother and my mother set out from home to go to grandma's house together. After they left for an hour, my brother found that the gift he had brought to grandma was left at home, so he immediately took the gift with him and chased her at the speed of 6 kilometers per hour. If my brother and my mother traveled 2 kilometers per hour, it would take them 1 hour and 45 minutes to go from home to grandma's house. I asked my brother if he could take my brother and my mother to go to grandma's house Do you want to catch up with them?
Suppose that it takes x hours for a brother to catch up with his younger brother. From the meaning of the question: 6x = 2 + 2x, solving this equation: x = 12. The younger brother walked for 1 + 12 = 1 hour, 30 minutes < 1 hour, 45 minutes, and did not arrive at grandma's house. A: the elder brother can catch up
The taxi charge standard in our city is as follows: 10 yuan for less than 3 km, 2 yuan for every additional 1 km for more than 3 km to less than 8 km
Xiao Ming paid 35 eyes from home to grandma's house. Please calculate the distance between Xiao Ming's house and grandma's house
10 yuan for the first 3 km
8 km 5 * 2 = 10 yuan
The remaining 35-10-10 = 15 yuan, 15 / 2.5 = 6 km
So the distance is 8 + 6 = 14 km
The charging standard of taxi in a city is as follows: 4 yuan within 4 km, 2 yuan per km from 4 km to 8 km, and 2.4 yuan per km after 8 km
If a person has traveled x (x > 8) kilometers in a car, (1) express the cost that the person has paid; (2) if the person has paid 30 yuan in total, what is the distance that he has traveled?
（1）∵x＞8
∴4+2×4+2.4（x-8）
（2）4+2×4+2.4（x-8）=30
12+2.4（x-8）=30
x=15.5
RELATED INFORMATIONS
- 1. In Xiaogang's Bank, there are 20 2-cent and 5-cent coins, totaling 7.6 yuan. How many 2-cent coins are there?
- 2. Xiaogang starts from home every morning. It takes 9 minutes to eat breakfast in the morning market 200 away. Then it takes 18 minutes to walk 400 meters to school. After school in the afternoon, Xiaogang takes 23 minutes to walk 500 meters home. How many kilometers does Xiaogang walk from school to home? What's the average speed?
- 3. Xiao Ming made a local call for six minutes, and then made a long-distance call. The total cost was 2.10 yuan. What's the talk time of the long-distance call 20 yuan for the first three minutes of a local call, and 0. 10 yuan for each subsequent call. 0
- 4. Typical problems in practical engineering problems For a project, it takes 20 days for team a to do it alone, and 12 days for team B to do it alone. It is known that team a has done the project for several days, and then team B has continued to complete it. It takes 14 days from the beginning to the completion, so how many days did team a do it first? How many days did Team B do it again?
- 5. When I solve the applied problems of mathematical engineering problems, I know the equivalent relation, but I can't make equations. What should I do?
- 6. For a project, it takes a day for Party A to finish it alone, and it takes B day for Party B to finish it alone. For Party A and Party B to cooperate for 5 days, how many parts of the project can be completed? Regard the project as unit 1
- 7. 1、 It is only a formula, not a calculation 1. The third grade students plant trees. There are 50 students in the first class, with an average of 3 trees per person. There are 55 students in the second class, with a total of 165 trees. How many trees per person in the third grade? 2. Mr. Wang deposits 5000 yuan in the bank for three years at an annual interest rate of 2.4%. When it comes to maturity, how much is the total amount of principal and interest after deducting the interest tax (20%)? 3. Mingmingjia plans to spend 800 yuan in May, but the result is 950 yuan. How much is the overrun? 4. The price of a garment will be 80 yuan after 20% price reduction. How much is the original price? 7. The income of wheat in Jingcheng Township this year is 5% higher than that of last year, just 60 tons higher than that of last year. How many tons of wheat in Jingcheng Township last year? 2、 Practical questions 1. The fruit shop has 1500 kg of fruit, and the pear is three fifths of the apple, and the pear is three fourths of the peach. How many kg are the peaches? 2. The number of goats is 200 less than that of sheep. The number of goats is 60% of that of sheep. How many goats and sheep are there respectively 3. In one way, team a and team B cooperate for 10 days, and team a can complete it by himself for 30 days. After 4 days of cooperation, team a is taken away because of something, and the rest is completed by team B. how many days will it take team B to complete the task?
- 8. If 3 / x = 1 / y = 4 / Z and XY + XZ + YZ = 76, find the value of 2 (square of x) + 12 (square of Y) + 9 (square of Z) Although it does seem wordy, you can still understand it if you look at it carefully,
- 9. Summer homework of mathematics in grade one of junior high school 1. The square of X + the square of Y - 8x - 10Y + 41 = 0, find the value of X / y + Y / X 2. Square of X + square of Y - 6x - 4Y + 13 = 0, find the value of (x + y) to the power of 2008
- 10. Write a paragraph under the title of "what is happiness", within 150 words
- 11. 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
- 12. 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?
- 13. 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
- 14. 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?
- 15. The conclusion of the experiment of measuring the acceleration of the car with the clock
- 16. When is the first time that the hour hand and the minute hand coincide?
- 17. 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
- 18. 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
- 19. 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?
- 20. (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