![](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>)
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
Four practical problems
(1) The top is 26 yuan more expensive than the skirt, and the skirt is 106 yuan cheaper than the top. How many yuan does it cost to buy a suit
(2) Uncle Wang bought back the 24.8-meter fence and prepared a rectangular chicken house with a length twice the width. How many meters should the width and length be?
(3) Mingming's stamps are 1.8 times of Honghong's. If Mingming gave Honghong 20 stamps, they would be the same number. How many stamps did they have?
(4) Beibei has 35 yuan of pocket money and Lili has 21 yuan. How many days later do they have the same amount of money left? (Lili spends 0.5 yuan a day and Beibei spends 1.2 yuan a day)
The equation must be used
1. Suppose the price of skirt is x yuan, then the price of coat is 2x + 26 yuan
(2x+26)-x=106
So, x = 80
So the price of the coat is 186 yuan
Then, the price of a suit is 186 + 80 = 266 yuan
2. If the width is x meters, the length is 2x meters
2X + 2 * x = 24.8
===> 4x=24.8
===> x=6.2
So, the width is 6.2 meters and the length is 12.4 meters
3. If there are x red, then there are 1.8x
1.8x-20=x+20
===> 0.8x=40
===> x=50
So, there are 50 in Honghong and 90 in Mingming
4. After X days, there are as many as two people
35-1.2x=21-0.5x
===> 0.7x=14
===> x=20
That is, 20 days later, two people as much
For a project, team a did it alone and completed it in 20 days; Team B did it alone and completed it in 30 days. Now the two teams cooperate, during which team a has a rest of 5 days and team B has a rest of 4 days
B took a rest for 4 days (there is no rest for two teams on the same day)
Team a does it alone for 20 days, so when team B has a rest, team a completes 4 / 20 = 1 / 5,
Similarly, when a is at rest, B completes 5 / 30 = 1 / 6,
So they cooperated for (1-1 / 5-1 / 6) / (1 / 20 + 1 / 30) = 7.6 days,
Therefore, it takes 7.6 + 5 + 4 = 16.6 days from start to finish
For a project, team a will finish it in 20 days and team B will finish it in 30 days. Now the two teams work together. During this period, team a has a rest of 5 days and team B has a rest of 4 days?
Team a: 1 / 20 * 4 = 1 / 5, team B: 1 / 30 * 5 = 1 / 6, the remaining days: (1-1 / 5-1 / 6) / (1 / 20 + 1 / 30) = 7.6 days, 7.6 + 4 + 5 = 16.6 days
For a project, team a finished it in 20 days and team B finished it in 30 days. Now they are working together. Team a took three days off and team B took several days off. It took 16 days from the beginning to the completion. How many days did Team B take off?
[120 × (16-3) + 130 × 16-1] △ 130, = [1320 + 1630-1] × 30, = [3960 + 3260-1] × 30, = 1160 × 30, = 5.5 (days); answer: Team B had a rest of 5.5 days
There are 400 movie tickets of 3 yuan, 5 yuan and 7 yuan, with a total value of 1920 yuan, of which 7 yuan and 5 yuan are equal. How many movie tickets are there for each of the three prices?
There are 7 yuan and 5 yuan each, including 3-yuan (400-2x), 7 x + 5 x + 3 (400-2x) and 7 x + 5 x + 3 (400-2x) and 7 x + 5 x + 3 (400-2x) and 7x + 5 x + 3 (400-2x) and (7x + 5x + 3 (400-2x) and (7x + 5x + 3 (400-2x) = 1920, & & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp & nbsp; & nbsp; & nbsp & nbsp; & nbsp & nbsp & nbsp & nbsp; & & nbsp; & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp & nbsp; & nbsp; & x = 120; & nbsp; & nbsp; & nbsp; & nbsp; 3 yuan: 400-2 × 120 = 160. A: there are 160 for 3 yuan, 120 for 7 yuan and 120 for 5 yuan
Homework problem is the fourth unit of the target test in the sixth grade of primary school mathematics
Question (6) in the second paper of unit 4 of the first volume objective test of primary school mathematics grade 6
The diameter of a DVD disc is 12 cm, and there is a hole with a diameter of 1.5 cm in the center (as shown in Figure 1). The upward side of the DVD disc is about 2.3 cm to 5.5 cm in radius (as shown in Figure 2)
Thank you for your help~
I can't see it in the picture, but it seems to find the area of the ring
Pi * 5.5 ^ 2-pi * 2.3 ^ 2 = 78.4 square centimeter
There were 54 students in class 6 (1), of whom 5 / 9 were boys, and later 5 / 9 were boys
If anyone has the answer to this assignment, please tell me the answer to question 3
Do this topic is to grasp the invariants, that is, girls. Boys accounted for 5 of 9, then girls accounted for 4 of 9
Female: 54x (5 out of 1-9) = 24
When boys turn away, they account for 13 out of 25, while girls account for 12 out of 25
Now there are students in the class: 24 divided by (1-13 / 25) = 50
Transfer students: 54-50 = 4
Answer: the boy transferred 4 people
The ratio of class 6 (1) to class 6 (2) is 8:7. If 8 students in class 6 (1) are transferred to class 6 (2), the ratio of class 6 (1) to class 6 (2) becomes 4:5?
A: there were 48 students in class one and 42 students in class two
How to write the comments on parents' test paper
What grade are you a student's parents? What's the test paper? How many points are you getting
RELATED INFORMATIONS
- 1. 1. Fill a cuboid container with a bottom of 15cm * 15cm with water and pour water into a cuboid iron box with a length of 20cm, a width of 15cm and a height of 10cm. When the iron box is full, how many centimeters does the water surface in the cuboid container drop? 2. The long side of a rectangular field is close to the wall, the length of the wall is 14m, and the other three times can be surrounded by bamboo fence. Xiao Wang plans to use the existing 35m long bamboo fence to surround a chicken farm, which is 5m longer than the width (the length of the rectangle is parallel to the wall). Is this design in line with the reality? If so, ask for the area of the chicken farm; if not, please design a reasonable plan, And calculate the area of chicken farm 3. The cylindrical container with height of 20cm and bottom area of 20cm square is filled with liquid. The volume of liquid is 3 / 4 of the volume of the cylinder. Now pour the liquid into the cube container with edge length of 2cm. After filling, how much does the liquid level drop in the cylinder container? 4. To make a 5m long and 3M wide uncovered water tank, the cost of the bottom of the tank is 60 yuan per square meter, and the cost of the wall is 2 / 3 of the cost of the bottom of the tank per square meter. If the whole water tank costs 1860 yuan, the height of the water tank can be calculated
- 2. 1. Try to prove that: if 19 points are placed in a square with one side length, and any three points are not on a line, then there is at least one triangle with these points as its vertex, and its area is not more than 1 / 18 2. Any five integers, will be able to choose three integers, so that their sum is divided by 3
- 3. Sixth grade mathematics problems, to process When a runs three eighths of the whole race, B runs one third of the race. After that, a's speed will not change, B's speed will increase. When both of them reach the finish line at the same time, B's speed will increase by ()% It takes 12 hours (including 12 hours) at most for a ship to carry fuel. When it leaves, it travels 30 kilometers per hour. When it returns along the original road, its speed is 8% of that when it goes. How many kilometers can the ship return?
- 4. The sum of a and B is 1.98. If the number of a is reduced to one tenth of the original number, then the ratio of a and B is 1:1. What is the original number of a and B?
- 5. A math problem, urgent, fast! Sixth grade, to process! There are several machine parts. Every 12 parts are packed in a box, there are 11 more. Every 18 parts are packed in a box, there is one less. Every 15 parts are packed in a box, and there are seven more than two. It is known that the parts are between 300 and 400. How many parts are there? Thank you
- 6. 1. A barrel of oil weighs 40 kg. After four fifths of the oil is poured out, the barrel weighs 12 kg. How many kg of oil is there in the barrel? 2. The number of school art group is six more than that of sports group, and the number of sports group is one fifth less than that of art group. The number of calligraphy group is four fifths of that of art group. How many people are there in calligraphy group?
- 7. A+A+A+A+A=100 (B + b) / (division sign) a = 100 B+A+B+A-C=100 Then: a = () B = () C = ()
- 8. Put 7 pieces of iron into 3 boxes, at least 3 pieces of iron sheet should be put into the same box. Why?
- 9. There are 50 chickens and 160 feet in the same cage. If all chickens are assumed to be rabbits, then 50 rabbits will have (?) feet, which will be more than the actual (?): Why are there so many more chickens? Because if a chicken is assumed to be a rabbit, it will have (?) feet, which will be more than the actual (?) = (?), we need to divide (?) by (?) = (?) if a chicken is assumed to be a rabbit, then rabbits will have (?) - (?) = (?)
- 10. There are 32 bottles of 100kg oil. How many large and small oil bottles are there?
- 11. （1）2—（1—y）=—2 （2）5—（x—1）=3—3x （3）3—2（2x+1）=2（x—3）（4）4x—3（20—x）=6x—7（9—x） （5）12（2—3x）=4x+4 （6）2（200—15x）=70+25x （7）4x—3（20—x）+4=0 （8）1—3（8—x）=—2（15—2x）
- 12. Solving equation problems and calculation problems (with answers) More than 45 equations, more than 30 calculations The answer must be yes
- 13. 40 practical problems of solving equations in Grade 6 Need answers!!! 40 sixth grade equation solving problems... Use it in a hurry!!!
- 14. Primary school mathematics calculation problems (solving equations) 1.2：X=2：15 3/4：6/7=X：5/12
- 15. Test questions for Fill in the blanks: 1. If a and B are reciprocal, then a is proportional to B 2. The thickness of a water cup is uniform, and the depth of water is proportional to the volume of water 3. A precision part is drawn by 5:1 on the drawing, the length is one centimeter, the actual length is 5cm, if the actual width is 0.1cm, then the width on the drawing is () cm 4. The rectangle has a certain area, and its length and width are in proportion 5. 3cm on a map represents the actual 60km. The scale of this map is (), the actual distance is 150km, the distance on the map is (), the distance on the map is 4.5cm. The actual distance is () km 6. When a circle is enlarged by 3:1, the perimeter is () times of the original perimeter and the area is () times of the original area 7. After a kind of rice is rolled into rice, the ratio of rice to rice bran is 7:3. At present, 400 kg of rice is rolled into () kg of rice and () kg of rice bran 8. When a triangle is enlarged by 3:1, the three sides are 9cm, 12cm and 15cm respectively, then the original lengths of the three sides are () () () 9. Draw a circle with a circumference of 6.28 meters on a scale of 1:100 with a radius of () 10. The area of a triangle is 12 square centimeters. What's the area of a figure when you put it under a magnifying glass that can magnify 4 times 11. In the scale of 3.6: x = 4:5, the value of X is () 1. A book on page a has read page B in 5 days, and the rest will be finished in X days A.B:5=A：X B.B:5=(A-B):X C.A:5=B:X 2. About the perimeter, side length and area of a square, the following description is correct () A. The area is proportional to the side length B. Perimeter is in direct proportion to area C. Perimeter is in direct proportion to side length 3. The following two quantities are inversely proportional () A. Circumference and diameter of a circle B. Volume and height of cylinder C. Total price is fixed, quantity and unit price
- 16. Solving ten problems of solving inequality, with solutions
- 17. (1) Cylinder, the diameter of the bottom is 10 meters, calculate the volume (2) Cone, 16 decimeters high, 15 decimeters diameter of the bottom, volume (3) A cylindrical bucket, bottom circumference is 314cm, the cylindrical bucket side area is how many square centimeters? (4) Gaojiatun needs to dig a cylindrical reservoir with a volume of 37.68 cubic meters and a depth of 3 meters. How many square meters should its bottom area be? (5) In a measuring cylinder with a bottom radius of 5cm, there is 8cm high water in it. When an iron block is put into the measuring cylinder, the water surface rises to 10cm, and the volume of the iron block is calculated (6) ABCD is a rectangle. If DC = 40 cm and BC = 25 cm are known, and then rotate 360 degrees around DC, what is the volume of the body after rotation (7) A cylindrical aluminum ingot has a circumference of 62.8 cm at the bottom and a height of 25 cm. What is the volume of this aluminum ingot? (8) There is a conical part with a diameter and height of 6cm at the bottom. What is the volume of this part in cubic centimeter? (9) There is a conical part with a bottom area of 54 square centimeters and a height of 6 centimeters. What is the volume of this part in cubic centimeters? (10) It's a rectangle, 24.84 cm long, and half of its width is the diameter of a bottom. If you cut it like this, you can make a tin oil bucket and calculate its volume (11) A cylinder with a circumference of 9.42 cm at the bottom, after obliquely cutting off a section, calculate the volume of cutting off, and the height of cutting off is 2 cm
- 18. She _____________ (go) to the cinema with her classmate tomorrow evening. Ben ___________ (want) a penfriend in China. I am _____________ (do) my homework now.
- 19. Some primary school sixth grade English topic. Urgent! It must be finished within today, or it will be useless! Make a mistake, make a change Last weekend,Mum taked me to see my grandparents. Mary is tallest in our class. This apple is biggest than that one. My grandpa is the funnyest old man. Conjunctions into sentences family to weekend going What your this are do ? bookstore many to and We the bought books went . Fill in the blanks with the words in the box blue,boys,clean,fly,friends,had,liked,river,was,white I am a little bird, I live in a small city . I____ not happy in the past .Because I could only ___ in the gray sky, but I didn't like the gray sky. I ____ the blue sky, but it wasn't_____ . There was only one tree in the street. My home was in the tree. There was a river near the tree,but the water was not____ . There weren't any fish in it. I_____ no friends. But i'm happy today. I can see many_____ and girls planting trees. Oh! There are many trees around my home ! That's great! The sky will be blue. The clouds will be___ .The grass will be green and the _____ will be also clean! Wow, I will have many____ Don't fight in the back! I'm so tired! It's gone now!
- 20. 1.There are some flowers __ in__ the__ basket__ (question on the line drawing part) 2.There are __ two__ vases__ In the bedroom 3.The towel is __ a__ squrae__ (ditto)