Ask a math culture thinking question, math thinking question?

Hehe, a freshman in the Department of Mathematics, reading the course "History of Mathematics", number theory is also called arithmetic, and it and geometry are the two oldest branches of mathematics. Traditional geometry has withered, and traditional number theory still has a large number of problems that cannot be solved. The discipline of number theory originally began with the study of integers, so it is called integer theory.

Later, integer theory was further developed, and it was called number theory. To be precise, number theory is a discipline that studies the properties of integers. Due to the development of modern computer science and applied mathematics, number theory has been widely used.

For example, many research results within the scope of elementary number theory are widely used in computational methods, algebraic coding, combinatorics theory, etc.

My understanding is as Gauss said.

Mathematics is the foundation of all sciences.

Mathematics is a complete form of logic.

He never mixed even the slightest human emotion.

59 seconds. This question is pure thinking and does not require a column style.

For the sake of convenience, when thinking about it: Suppose 3 seconds 1 second changes 2 4, 2 seconds after the change, divided into eight seconds after the can be filled with bacteria, put a bacteria. This can be filled.

Divided into two bacteria, after the change of 4 8 2 seconds after one second of change, two seconds full. We can also assume that putting a 5 second can be filled with bacteria. 32, then put both bacteria after 4 seconds is enough.

The math is interesting that this is a relatively small data deduction law, and the result is a relatively large data. After graduating from secondary school, you will learn about the relatively small data and draw general conclusions.

Ditto. And it's called mathematics because it covers almost the entire doctrine that is the basis of science and of living nature.

There are a total of x books, so according to the plan, they are 5 12x, 4 12x, 3 12x, adjusted to 7 18x, 6 18x, 5 18x, and then there is a class with 12 more books, compare, only the third one is bigger than before, so 5 18x-3 12x=12, and x=432 books, so the actual score of the class is 5 18*432=120 (this).

Primary 4 Math Thinking Questions Subtracted: 120 2=60 Subtraction plus difference = Subtracted 2The sum of the subtracted numbers is 120, and the difference is 3 Minus: 60 (1+3)=15 Difference: 60-15=45

100 5 = 20 100 black sesame seeds are 20 times more than 5 black sesame seeds, then there are 20 of these 100 seeds in the bowl.

100 20 = 2000 capsules.

A: There are about 2,000 sesame seeds in this bowl.

Method 1: Column equations.

There are x big monks and y small monks.

x+y=100

3x+y/3=100

The solution is x=25 and y=75

That is, 25 big monks and 75 small monks.

Method 2: Comparative Method.

If all of them are great monks, they should eat 3*100=300 fritters, but they actually only eat 100. 200 less.

A big monk eats 3-1 3=8 3 fritters more than a small monk, then the number of small monks is:

The number of great monks is 100-75=25

Suppose A is x, and B is 3x of 4, so x-3x=4/4 gives x=, so A is, B is.

Let B be x, by the title.

x+:x4:3 (according to the product of two extroverts equals the product of two introverts) is calculated without pen and paper.

It doesn't count.

1.The front wheel of a roller is cylindrical, with a diameter of 2 meters, a wheel width of meters, and the front wheel rotates for a week, how much road surface can be pressed?

Pavement area = front wheel circumference x wheel width.

So = d x 5

2.How big is the surface area of a 10-centimeter-long cube of timber cut into the largest cylinder?

Because the edge length of the cube is 10 cm, the height and diameter of the cylinder are 10 cm.

So surface area = 2 x 25 + 10 x 10 3A cylindrical pool with a bottom diameter of 20 meters and a depth of 2 meters, plastered with cement on its sides and bottom, how large is the area of the cement? Because the area of plastered cement = the area of the cylinder with a bottom area removed, it = 100 + 2x20

1. One week is the area of the cylindrical side, that is, the circumference of the front wheel multiplied by the width of the wheel.

2. The diameter of the largest cylinder is 10cm, the height is 10cm, and the surface area is the side area plus the top and bottom area.

3. The area of the side is the circumference of the bottom surface multiplied by the height, and the base area can be found by the formula, and the two can be added.

The first problem is to find the side area of a cylinder.

In the second question, the radius and height are both 10 centimeters, find the surface area.

The third question, side area + bottom area.

Note: It's all in the formula book.

1.It is to find the side area of this cylinder.

i.e. 2The diameter of the maximum cylinder is 10cm, and the height is 10cm, which is the side area + bottom area * 2

3.The side area is the circumference of the bottom surface multiplied by the height, and the volume area is the square of the radius of the bottom surface.

Note, * is a multiplier sign.

Quiz everyone: This is a math problem that can measure whether a person has business acumen. Master Wang is selling fish, a pound of fish at a price of 45 yuan, now a big sale at a loss, the customer bought a kilogram for 35 yuan, gave Master Wang 100 yuan fake money, Master Wang has no change, so he asked a neighbor for 100 yuan.

Afterwards, the neighbor found out that the money was fake in the process of depositing money, and it was confiscated by the bank, and Master Wang lost 100 yuan to the neighbor, how much did Master Wang lose in total?

Note: The difference between catties and kilograms.

A total loss of 100 + (45 2-35) = 100 + 55 = 155 yuan.

If you need to saw 4 sections 3 times, it will take time = 48 3 = 16 seconds each time.

If you saw the other one and it took 176 seconds, you saw 176 16 = 11 times.

Therefore, 11 + 1 = 12 segments were sawn.

A timber is sawed 3 times in 4 sections, and the time for each sawing is 48 3 = 16 (seconds);

The other piece of wood took 176-48 = 128 seconds, sawed 128 16 = 8 times to make 9 sections.

Don't add a don't believe you to do the math and ask for adoption.