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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
1. If x cm is lowered, then:
15*15*x=20*15*10；
x=40/3
Down 40 / 3 cm
2. If the length is set to be x m, then x 14 does not conform;
If the length is 14m, the width is 14-5 = 9m, s = 9 * 14 = 126m & # 178;
3. If xcm is lowered, there are:
20*x=2*2*2=8；
x=0.4；
So it's down 0.4cm
4. If the height is set at x m, there are:
5*3*60+2(5x+3x)*60*(2/3)=1860;
900+16x*40=1860;
640x=960;
x=1.5
The height of water tank is 1.5m
After reading the children's papers, parents write suggestions and comments on their children. How should parents write suggestions and comments?
First of all, I want to thank the teacher; moreover, how the child's performance test, if it is good, I want to thank the teacher again for his tireless guidance to the child. If it is not good, I hope the teachers can give strict education, or according to the students' personality, you suggest the teacher how to educate the child, so as to encourage the child's interest in learning and show his determination to stay at home
How to write parents' opinions on the paper?
This time, I didn't do very well in the exam. I looked at the paper and found some mistakes, such as unclear concept, careless examination, careless calculation. In addition, at home these days, I found that he didn't do his homework very seriously, his heart was a little impetuous, and he couldn't step down. In order to make him study well, I talked to him and understood his mood. Maybe the complicated things between his classmates made him confused, In order to make him feel at ease, I will give him good conditions, let him feel at ease to learn, the definition of solid, clear, get through, class to listen carefully, take notes seriously, do not understand must ask the teacher
How to write parents' opinions on the test paper
This is the parent? Well, let's say something like: if there is something wrong with the child, ask the teacher to discipline him strictly. It can also be written like this: I hope the teacher can contact us more, and we want to pay attention to the child's learning situation in school. This kind of thing is almost OK. After all, the child also has self-esteem, so don't write something very dissatisfied with the child or the teacher
How to write parents' opinions on examination papers
Just write it according to the children's learning situation. Generally, there will be some polite words, such as "the teacher bothered"
Sixth grade and mathematics final quality test questions (paper) 2007.1
Fruit shops buy some fruits. The number of baskets of pears is 3 / 4 that of apples, and the number of baskets of apples is 4 / 5 that of oranges. If you buy 15 baskets of pears, how many baskets of oranges do you buy?
Guo Daiqi,
【1】 15 △ 3 / 4 = 20 (basket)
【2】 20 △ 4 / 5 = 25 (basket)
By the way, I wish you a happy New Year's Day!
How to do the last question in the final test paper of sixth grade mathematics in the first semester of 2007 academic year?
In 2006, the total expenditure of Tianyi high tech R & D company was 2 million yuan and the total income was 2.4 million yuan. In 2007, the company took measures to control costs and improve efficiency, so the total expenditure was 1.78 million yuan and the income increased to 3 million yuan. Compared with 2006, how much did the expenditure decrease? How much did the income increase? How much did the profit increase?
Urgent need
Compared with 2006, the expenditure in 2007 decreased by (200-178) / 200 = 11%, the income increased by (300-240) / 240 = 25%, the profit in 2006 was 240-200 = 400000 yuan, the profit in 2007 was 300-178 = 1220000 yuan, the profit in 2007 increased by (122-40) / 40 = 205% compared with 2006
Answers to the final mathematics examination questions of grade 6, Volume 1, 2007
The turnover of a hotel in October is about 300000 yuan. If the business tax is paid according to 5% of the turnover, how much should the hotel pay in October? 30 × 5% = 15000 yuan. Xiaofei used to use about 10 tons of water every month. After changing the water-saving tap, it uses about 9 tons of water every month, which is more economical than before
Party A and Party B make a total of 200 parts. One third of the number of parts made by Party A is 19 more than one tenth of that made by Party B. how many parts do Party A and Party B make?
Let a make X and B make y
x+y=200
1/3x=1/10y+19
1/3x-1/10y=19
x-3/10y=57
x+y=200
13/10y=143
y=110,x=90
A: a 90 B 110
Draw a rectangle with the ratio of length to width of 5:3 on the drawing with a scale of 500:1. The perimeter of the rectangle is 20cm. What is the actual area of the rectangle?
The answer must be correct!
The actual aspect ratio of the land will not change on the drawing, so the aspect ratio of the rectangle on the drawing is also 5:3. Given that the circumference of the rectangle is 20 cm, then we can calculate the length and width of the rectangle on the drawing
20 △ 2 = 10 (CM)
The length of the rectangle is: 10 △ 8 × 5 = 6.25 (CM)
The width of the rectangle is: 10 △ 8 × 3 = 3.75 (CM)
The scale is 500:1
Then the actual length and width of the rectangle is: 6.25 × 500 = 3125 (CM) 3.75 × 500 = 1875 (CM)
So the area of the rectangle is: 3125 × 1875 = 5859375 (square centimeter)
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