Is the junior high school volume of the Mathematical Olympiad Small Series good, is it simple, I a

My experience: When I was very young, I liked to drill around in cabinets or toys with small spaces, stopping every now and then to look at the edges, planes, and touch them with my hands. It's all unintentional fun, but of course I play with structural toys.

But when the teacher brings it up in class, I can extract this part of the memory. Therefore, it is recommended that you first observe the structure of the classroom, and then, memorize the typical example questions, so that you can see that the questions can be completely written on the back of the book, exactly like the book, and understand the meaning of each word. That's it.

When it comes to elevation questions, you should remember that any question is a combination of several simple basic questions. So we learn the basics first and then combine, you have to calm down and identify the conditions you are familiar with and write boldly, and everything will be solved.

Good luck with your studies!

The most difficult questions also use basic knowledge, and it is recommended to lay a solid foundation. . . Geometry is generally a graph problem, and sometimes you can combine algebra and graphics to solve the problem after learning geometry. . . In addition, it is best to summarize and summarize difficult problems to solve...

The metaphor can be used in a mistake book to write down each wrong question and mark it in the calculation to that step, and then how to solve it... It's not hard to do that.

If the foundation is not good, it is recommended not to buy it.

I think it's actually okay The key is to look at the quality of the questions Each issue is good or bad, just pay attention to the expansiveness of the topic.

There seem to be two of the junior high school papers of the small blue book that are relatively simple, and the other ones are relatively much more difficult.

Olympiad Classics. It is mainly aimed at the problem of combining numbers and shapes in the high school entrance examination.

Of course, it's the second version, and there will be a lot of improvements, otherwise if you come to the answer network, there will be a lot of Olympiad questions.

Extract the common factor.

This is the most basic. It's just that if there is a common factor, it will be brought up, and everyone will know this, so I won't say much.

2.Perfectly squared.

a2+2ab+b2=(a+b)2a2-2ab+b^2=(a-b)2

2.If you see that there are two numbers squared in the formula, you should pay attention to it, find out if there is twice the product of the two numbers, and if so, follow the above formula.

3.Square Difference Formula.

a2-b2=(a+b)(a-b)

This should be memorized, because it is possible to add terms when matching perfect squares, and if the front is perfectly squared, and then subtract a number, you can use the square difference formula to break it down.

4.Cross multiplication.

x2+(a+b)x+ab=(x+a)(x+b)

This one is very practical, but it is not easy to use.

When the above method cannot be used to decompose, the lower cross multiplication method can be used.

Example: x2+5x+6

First of all, it is observed that there are quadratic terms, primary terms, and constant terms, which can be multiplied by crosses.

The coefficient of the primary term is 1So it can be written as 1*1

The constant term is 6It can be written as 1*6, 2*3, -1*-6, -2*-3 (decimals are not recommended).

Then arrange it like this.

The positions of the following columns can be reversed, as long as the product of these two numbers is a constant term).

Then multiply diagonally, 1*2=2, 1*3=3Add the product again. 2+3=5, which is the same as the coefficient of the primary term (it may not be equal, so you should try another time at this time), so it can be written as (x+2) (x+3) (at this time, it will be done horizontally).

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How can there be anything that doesn't cost money? Amitabha Buddha bless you.

Look at the basic model more, learn some knowledge appropriately (four-point common circle, circle power theorem, sine and cosine theorem), and you can use the new Peiyou competition or the Olympiad.