Extended Math Problems, Math Extended Questions

If there are x boys, then there are 325-x girls.

List the equations according to the title:

x+25+(1-5%)(325-x) 325+16 solution: x 145

A: There are 170 male students.

2. Let B have x kilograms of oil.

Then A turns out to have kilograms of oil.

List the equations according to the title:

1/7（x-1）＝2/21（

Solution: x kilograms. Answer: The original kilogram of oil.

3. The format of the landlord in the last question is not well played.

1 (1+1 (2+(1 (x+1 4)))8 11 counts down on both sides at the same time.

1+1 (2+(1 (x+1 4))))11 8 and both sides at the same time -1

1/（2+（1/（x+1/4）））3/8

Count down again. 2+(1 (x+1 4)) 8 3 re-21 (x+1 4) 2 3

Count down again. x+1/4＝3/2

Re-1 4x

1、x+y=325

x+25+y（1-5%）=325+16

Male) x = 180

Female) y=145

2. A x, B is.

x-1)*2/21=(

x=3 can't understand the question.

1.If there were x boys, then there were 325-x girls.

x+25+(325-x)*(1-5%)-325=16 gives x=145

So there are 170 boys.

2.Let A have the original x kg, then B has (

x-1）*2/21=（

The solution is x= kg

So it turns out that the nail has oil kg

3.I don't understand the landlord's title.

This is entitled the problem of catching up in the travel problem, after the car leaves place A for 4 hours, it leaves place A 30 4 = 120 kilometers, and it is known that a train also travels from place A to place B at a speed of 90 kilometers per hour, so the train is 90-30 = 60 kilometers faster than the car in one hour, so it only takes 2 hours to catch up with the car at the midpoint of A and B, so it takes 4 hours for the train to complete the journey, and the distance between the two places is 90 2 2 = 360 kilometers.

Solution: 30 4 (90-30) 2,30 4 60 2,120 60 2,2 2,4 (hour);

90 4 = 360 (km);

A: A and B are 360 kilometers apart

So the answer is: [360].

From the meaning of the title, we directly calculate the distance traveled by the train, which is equal to half of the distance between A and B, and we need to know the speed to find the distance, so we need to know the travel time of the train, and the car drove from A to B at a speed of 30 kilometers per hour, and after driving for 4 hours, it traveled 120 kilometers.

After that, the train catches up with the car at a speed of 90 kilometers per hour, and they are 120 kilometers apart, and the train is 60 kilometers faster than the car per hour, which means that it takes two hours to catch up, so the train travel time is equal to 2 hours, and the distance traveled by the train is 180 kilometers, so the distance between A and B is 360 kilometers.

If the time from the departure of the train to catching up with the car is x, you can get 30*4+30x=90x, and the solution is x=2, so the distance between A and B is 360 kilometers.

Because when the car and the train meet, the distance they have traveled is equal, which is the midpoint of A and B, so finding the time of meeting can naturally find the length of A and B.

1。Supermarket anniversary, carry out preferential activities. Wuxiao buys 1 bottle of milk tea, buys 5 bottles and gets 1 bottle free; Buy melon seeds for 10 yuan a pack, there are 10 small packs in each pack, buy 1 get 1 free; Buy pork jerky for 19 yuan per pack, and there are 10 small packets in each pack.

Xiaoli brought 200 yuan to buy snacks for 30 people, how can Xiaoli buy it, and how much money can she get back?

Milk tea; Buy 4 drink 5, drink 1 bottle per person, need to buy: 30 5x4 = 24 bottles, price: yuan) melon seeds: need to buy 3 packs: a total of 60 packets, 2 packets per person, price: 10x3 = 30 (yuan).

You need to buy 3 packs of pork jerky, 1 small bag per person. Price: 19x3=57 (yuan) can be retrieved at most:

200-84-30-57 = 29 (yuan)2. Grade 5 for a camping training, walking an average of 4 kilometers per hour, after the departure hour, Mr. Wu forgot to bring something, so he sent Xiao Ming back to school to pick up the bicycle, the speed of the bicycle is 16 kilometers per hour, how many minutes later, Xiao Ming can return to the team?

Hours: km).

Students Walk Together; 6+km).

The amount of management expenses in 1994 is: 40,000 * 10 = 4,000 yuan The amount of insurance expenses in 1994 is: 40,000 * 5 = 2,000 yuan The ratio of the amount of insurance expenses to the amount of management expenses in 1994 is:

The total expenditure in 1995 increased compared with 1994: 60,000-40,000 = 20,000 yuan.

The percentage increase is: 20000 40000*100 = 50

Management fee expenditure 4000.

In 1994, the ratio of the amount of insurance expenses to the amount of management expenses was 1:2.

Total expenditure in 1995 was 20,000 more than in 1994, an increase of 50 per cent.

However, there is no guarantee that the teacher's task will be necessary and efficient for everyone.

If the teacher is very nice, you can ask the teacher which of these assignments are not valid for you and can not do it (I have a teacher in high school who does graded homework, and some students just don't do homework. Because everyone's learning situation is different, everyone's needs are different.

If the teacher insists on asking you to do it (but I still hope you can try the above methods), you can either use the time in class to finish it, or improve the efficiency of doing the questions (knowledge proficiency is the premise, careful and cautious is the guarantee), or make up the homework in other classes (sub-subject classes), or you can distinguish by yourself which ones must be done and those that can not be done, and if you don't do it, just go to school and copy it the next day (I'm taking bad elementary school students?). ）

But make sure that the rest of the time is used to the fullest extent for extracurricular development. (I don't know what you mean by extracurricular development here), what is the purpose of extracurricular development? It is possible to indirectly improve the score or brainless drama (personal opinion:

Watching dramas is one of the most time-wasting things in the world, no)?

If you can't make full use of your extracurricular time for extracurricular development, then do your homework well.

I took these plans when I was in school, but fortunately I didn't do it to cope with the teacher's homework, but at that time I would give myself some extra work to brush up on the questions, and these hours were used for me to read. I'm grateful for that time, and some of the books are still being read now. I was amazed at my own writing during that time, and now I can't write it well.

(1) What is the 50th integer in this string of integers?

34 to -1 a total of 34, 0 is the 35th, 1-15 is 15 between 15 and -15 can be booked, so only need: (-16) + (17) +34).

The 50th integer in this string of integers is: 15

2) Find the sum of these 50 integers?

16)+(17）+.34）=（-16-34）x19÷2

1) The water level is 0, and 45 underwater is -45

55 meters underwater.

2) Descended 10 meters.

1) 5 bags. 2) 5 bags.

3) What is the maximum deviation from the standard quality in these 10 bags of food?

4) How does the quality of these 10 bags compare to the standard quality?

A: Total Analysis:

There is a negative error in the total amount, which is unqualified.

B: Positive and negative error analysis: 5 out of 10 bags of products have negative errors, which are non-conforming products C: If the minimum sales unit of the product is a bag, each bag is not allowed to have a negative error.

4.(3 and 1/7) (6 and 2/5) (2 and 1/5) (5 and 6/7) (4/5).

(3 and 1/7) (6 and 2/5) (2 and 1/5) (5 and 6/7) (4/5).

3 and 2/5 - 9 = -5 and 3/5

5 and 37 60

1: The first day was 3% less than the second day, that is, 3 Dan carried faintly, so there were a total of 100 mold halls.

2: The first and second days did a total of 25% for 200, so there are 800 in total.

Solution: Let the number of students who have won the first prize in school A be x, the second prize is Y, the third class is Z, and the number of first prize winners in school B is A, the second prize is B, and the third prize is C, according to the topic.

x=a ①6x/(x+y+z) =5a/(a+b+c) ②y+b)/(x+y+z+a+b+c)=20% ③z/(x+y+z)=50% ④

A (a+b+c) needs to be found

According to and get.

x+y+z)=6/5(a+b+c)

According to and get.

Then substitute (x+y+z)=6 5(a+b+c).

b/(a+b+c)=4%

The same can be obtained.

y/(x+y+z)=30%

And because so x (x+y+z)=1-30%-50%=20% and then according to the conditions

a/(a+b+c)=36%

A: The number of students who won the first prize in school B is equal to 36% of the total number of winners in the school