The determinant doesn t count, is that how this determinant counts?

Clarify the nature of the test, the principles of the test, and the content of the test.

The high school entrance examination is a selective examination, but the selection of the high school entrance examination is based on the nine-year compulsory education; The high school entrance examination should consider the potential ability of candidates to continue learning after entering high school, but high school education still belongs to the scope of basic education, so the high school entrance examination should still adhere to the principle of attaching importance to the examination of basic knowledge, basic skills and basic methods, and also insisting on the examination of candidates' subject ability. In addition to individual districts and counties or individual disciplines of the individual proposition, the vast majority of the city's districts and counties of the three subject examination by the city unified proposition, the city's proposition will strictly follow the requirements of the current secondary school syllabus, fully consider the districts and counties of the teaching situation, education reform, the use of teaching materials and the actual level of candidates, to the greatest extent to seek common ground and avoid differences, fully embodies the unified proposition of "smooth transition, step by step" principle.

2. Clarify the objectives of the exam and start with the basic knowledge.

To know is to know, to know, to know, "what is?" ", called knowing it; To understand is to understand, not only to know? And know "Why?"

It's called knowing why; To use is to learn and use, and to do the opposite.

3. On the basis of contact bypass, be able to use existing knowledge to solve new problems. The test goal of the high school entrance examination emphasizes the basics, which requires candidates to first know the "what" and then know the "why". The review of all kinds of candidates must start from the basics, and with a solid foundation, they can continue to climb up the ladder along the level of ability requirements.

This requires candidates to calm down, remember what should be remembered, memorize what should be memorized, and insist on practicing what should be practiced, be down-to-earth, step by step, and review the work to ensure implementation. Grasping the foundation is a real job, a tiring job, an honest job, no shortcuts, no luck, what is needed is diligence, steadfastness, hard work, and seriousness.

3. Check and fill in the gaps and grasp the weak links.

Question 1:

r1+2r4, r2+r1.

r1<->r4, (remember that there is a -1).

r3+r2, r4-13r2.

r4+3r3.

So the determinant = - 1)*(1)*2*(-20) = 40

Question 2: 1 2 3 ...n-1 n

1 0 3 ..n-1 n

1 -2 0 ..n-1 n

1 -2 -3 ..0 n

1 -2 -3 ..n-1) n

Add line 1 to the remaining lines.

You can get a triangular determinant.

Question 3 depends on the situation.

a|^3…If a is of order n, the result is |a|n, as for how to get it, the landlord can think about the arithmetic properties of each item in the n-order determinant to propose the common factor outside the determinant, and the above analysis is wrong, that is, |a|Yourself....Khan....

The method of arguing and fighting is as follows, carrying the grind.

Please do the divination test:

The interpretation of the gods is shown in the diagram of the blind spine grip seepage in the following paragraph.

The second row is minus the first row, and the third row is minus the second row.

3 3 3, the second draft of the above determinant is the same, the third line is the same, and its value is 0

It is better to use the diagonal rule to calculate simple key reeds.

Multiply the first row by -4 and -7 respectively, and then add to the second and third rows respectively.

Using the determinant property, the change of the line is calculated, and the result is 0

Summary. Hello, determinant send it!

This determinant is the answer directly and does not calculate.

Hello, determinant send it!

5 questions, if others ask me, I won't either.

Expansion: Mathematical thinking is the use of mathematics to think about problems or to build and solve problems in the form of thinking, thinking refers to the human brain's generalization of objective reality and frontal indirect reflection, belongs to the basic form of human brain activities.

Summary. In mathematics, a determinant is a function whose domain is defined as the matrix a of det, and the value is a scalar, written det(a) or |a|。The determinant can be seen as a generalization of the concept of directed area or volume in general Euclidean space.

In other words, in n-dimensional Euclidean space, the determinant describes the effect of a linear transformation on the "volume". Whether it is algebra, polynomial theory, or in calculus (such as commutation integration), determinants have important applications as a basic mathematical tool.

This determinant is the answer directly and does not calculate.

Comrade, you can just take a picture of the topic as a teacher.

5 questions, if others ask me, I won't either.

It's that 3-order phalanx, you can't solve it, right?

Is that the right thing to do.

Yes. Downgrading does just that.

Construct a row or order except for a number, the other is 0 then.

Good. This determinant is the answer directly, and the reason why it can't be calculated is that the lower-order method is ignored.

First of all, the true/false question type is a determinant question. Secondly, the mathematical distribution of matrices in the determinant is observed. Then, the determinant determinant category has one bar and one star, two bars and one star, arrow, bow, just row (column) with the same number, x-shaped, ab-shaped, Van der Mon these 8 categories of determinants.

The most difficult thing is recursion, but it is not often tested) Then, using the property of the determinant identity deformation, and then taking a small tool, good keying of the upper and lower triangles, doing the sock early determinant definition method, degrading, etc. Finally, the answer can be obtained according to the algorithm of the Four Pure Sparrows.

In mathematics, the determinant is a function whose domain is det, and the value is a scalar, written det(a) or |a|。The determinant can be seen as a generalization of the concept of directed area or volume in general Euclidean space. In other words, in n-dimensional Euclidean space, the determinant describes the effect of a linear transformation on the "volume".

Whether it is the best algebra, polynomial theory, or in the dispersion of dispersion (for example, in the commutation integral method), the determinant, as a basic mathematical tool, has an important use for guessing.

Add columns to the first column:

C3, hail C4, c5 to C2;

c4, c5 added to c3;

c5 to c4:

c2-xc1，c3-xc4，c4-xc3，c5-xc4：

d is a1=1, and the equal difference series of muffled friends fan q=-x:

Yes, in mathematics, a determinant is a function whose domain is defined as a matrix a of det, and its value is a scalar, written as det(a) or | a |

The determinant can be seen as the generalization of the idea of a directed area or volume in a general Euclidean space. In other words, in the space of a few miles of the n-dimensional reed ridge, the determinant describes the effect of a linear transformation on the "volume".