Small questions in the first year of high school mathematics preview, and materials for the first ye

The answer should all be correct.

For example, the requirement is that A belongs to P and 6-A belongs to P

Then 1 belongs to p, and 6-1=5 does not belong to p.

So there should be some ineligible.

The "empty set" here is not just a collection, but an element.

The element of "empty set" is in this set, just like A is in it.

Then you should be able to understand.

It's so hard to fight, you must get extra points. Math is hard to learn.

Piece. They are: , 2, and contained in are all true. The former is seen as a constituent element of a set, and the latter is seen as a set.

Empty set is a high-level form of collection that is not covered in depth in high school.

He puts the set into the set as an element, the set of sets, for example, the empty set, which is only involved in college...

I also asked the teacher to find out back then... It's not written clearly in the book at all.

1,2,5} These are all wrong, if you think about the question: a p, then 6-a p these are not satisfied, the answer is seven, I originally did this kind of set of questions I think one is to keep a clear head, and the other is to pay attention to the test. After doing it, you will find that the set is the most basic thing in high school mathematics, and the general review of the college entrance examination is the first to review this.

I think others are very good on the latter question, so I won't talk about it anymore. But in many questions, the empty set can't be missed, oh, I remember that I was doing the problem at the time, I often lost points because of this, haha, now I feel good about the problems that I haven't touched for a long time, and I say that mathematics is effective only if you insist on practicing.

First of all, it is recommended to read the book a few days before the start of school, to be honest, at the beginning of the study of functions, read by yourself, it is difficult to understand, so it is recommended to only read the textbook. Let's usually learn to use Queen Queen. Mathematics should be done more questions.

Then, it is recommended to buy a special book on the interpretation of ancient poems during the Chinese summer vacation, as well as a selection of college entrance examination essays, if you are interested, read a famous book for the college entrance examination, such as Dream of Red Mansions, Romance of the Three Kingdoms, etc. Usually study, the textbook is fully understood.

In English, let's read the textbook, preview the clauses and sentences, and find tutorial books with many practice questions.

Physical Chemistry, Queen Hung.

Personal point of view, the summer vacation is fun, the high school entrance examination is not easy, focus on the language, because after the start of school, there is not much time to spend on reading, after all, reading is the foundation of the language, after the start of school, spend more time on science, personal opinion.

Problem solving 1 Oxygenated acids: sulfuric acid, nitric acid, acetic acid, phosphoric acid Anaerobic acid: hydrochloric acid.

Monoacid: hydrochloric acid, nitric acid, acetic acid Polyacids: sulfuric acid, phosphoric acid.

High boiling point (stable acid): sulfuric acid, phosphoric acid Low boiling point acid: hydrochloric acid, precursor containing nitric acid, acetic acid.

Soluble chai acid: hydrochloric acid, sulfuric acid, nitric acid, acetic acid, phosphoric acid Insoluble acid: silicic acid.

Strong acids: hydrochloric acid, nitric acid, sulfuric acid Weak acids: acetic acid, phosphoric acid.

Problem solving 2 Soluble base: insoluble base: magnesium hydroxide, iron hydroxide.

Strong Huixiao alkali: sodium hydroxide, calcium hydroxide Weak alkali: magnesium hydroxide, iron hydroxide.

Strong electrolytes: sodium hydroxide, calcium hydroxide Weak electrolytes: magnesium hydroxide, iron hydroxide.

Problem solving 3: Insoluble salts CaCO3, Cu2(OH)2CO3, soluble salts NaCl, NaHCO3

Normal salts: NaCl, CaCO3 acid salts: NaHCO3 basic salts: Cu2(OH)2CO3

Sodium: NaCl Carbonate: CaCO3, Cu2(OH)2CO3 Bicarbonate: NaHCO3

Problem Solving 4 CO2 and SO2 belong to acidic oxides 2KOH + CO2 (less) = K2CO3 + H2O KOH + CO2 (foot) = KhCO3

MGO is a basic oxide, 2MGO + H2SO4 = 2H20 + MGSO4

Problem Solving 5 b

Mixture: A substance containing two or more pure substances.

Pure substance: A substance composed of the same substance is called a pure substance, which is further divided into elemental substances and compounds.

Elemental: A pure substance containing only one element.

Compound: A substance composed of two or more elements.

Elemental metal: An elemental substance composed of metallic elements.

Organics: Substances present in organic life, generally containing carbon but not carbonate.

Inorganic compounds: compounds that are not related to the body (a few compounds related to the body are also inorganic compounds, such as water), corresponding to organic compounds, usually refer to compounds that do not contain carbon elements, but include carbon oxides, carbonates, hydrides, etc., referred to as inorganics.

Acid: Cations containing only hydrogen ions talk about masking substances.

Base: Anion contains only hydroxide group examples of substances.

Salts: Substances containing acid ions and metal ions.

2) Oxygenated acid, anaerobic acid.

Monobasic acids, polyacids.

High boiling point is counted as waiter (stable acid), low boiling point is counted.

Soluble acids, insoluble acids.

Strong acid, weak acid.

Elemental: A pure substance containing only one element.

1. Further in-depth study of relevant knowledge of junior high school. For example: the factorization of quadratic trinomials, cubic and cubic difference formulas, perfect square and cubic formulas, the pictorial properties of quadratic functions, the root formula of a quadratic equation, Vedica's theorem (the relationship between roots and coefficients), plane geometry, etc. are all commonly used knowledge in high school learning.

2. Strengthen computing power. The requirements for high school mathematics in terms of calculation speed, accuracy and fineness are much higher than those of junior high school, and it is also a key ability to be examined in the college entrance examination.

3. Preview the mathematics textbook for the first year of high school. Have a general understanding of the content to be explained in high school, the set is the starting point of the whole high school, the function is an important chapter in high school, and it is also a difficult chapter, you should think deeply about the textbook, try to understand the concept from different angles, and experience the learning method of the concept; Through the practice after class, students can become proficient in the use of theorem formulas, and gradually transform from passive learning in junior high school to active learning in high school.

4. For students with a weak foundation in mathematics, they should use the vacation time to pay attention to remedial mathematics to lay a good foundation for the study of high school mathematics; For students who have advantages in mathematics, they should also pay attention to continue to improve their mathematical literacy and do not take it lightly.

1. The key to learning mathematics well is to learn to preview Preview enables students to independently learn the content of the new course before the teacher lectures, so as to achieve a preliminary understanding and prepare for the class intellectually and psychologically. Learning to preview is a key step to adapt to high school learning as soon as possible, and it is a key step for high school freshmen to understand and apply new knowledge and improve learning efficiency. 1. The premise of learning to preview is to clarify the meaning of learning to preview is the basic quality of modern high school freshmen, and the significance of preview is to cultivate good study habits, learn to learn consciously, master the method of self-study, and lay the foundation for future learning; Preview helps to understand the knowledge points, key points and difficulties of the new course, and can remove some obstacles for class. Preview helps to improve the effect of listening, and the questions that you don't understand or are vague during the preview are easy to understand when the teacher explains in class, so as to truly achieve the purpose of preview.

2. The basic method of preview is "reading, drawing, writing, and checking" "Reading" refers to reading the textbook carefully to understand the general idea of the textbook, and then reading it carefully according to the characteristics of the subject, such as mathematical concepts, rules, and derivation of example problems. "Drawing" is to draw the general idea, the key points, and the difficult points, points, rules, concepts, etc. of a section of the content are marked separately to help the memory of the class and the lectures.

"Writing" is to write down one's own opinions, experiences, and explanations to avoid forgetting in the corresponding places on the side of the book. "Check" is the effect of self-examination and preparation. It is best to close the book and think about what you have just read, which you can understand at a glance and what you do not understand vaguely, and do after-class exercises to check the effect of the preview.

Because bc ef ad ae:eb=m:n, df:

cf=m:n, so in abc eg:bc=ae:

EB+AE=M:M+N in CAD GF:AD=CF:

cf+df=n:m+n

So (m+n)ef=(m+n)[mbc (m+n)+nad (m+n)]=mbc+nad.

When EF is the median line, m:n=1:1 is 2EF=BC+AD to obtain the median line formula.

Let x1 x2 -b 2a

then f(x1)-f(x2).

ax1^2-ax2^2+bx1-bx2

a(x1-x2)(x1+x2)+b(x1-x2)(x1-x2)(ax1-ax2+b)

a(x1-x2)(x1+x2+b/a)

Because x1 x2 -b 2a

So x1-x2 0 x1+x2+b a 0 again because a 0

So f(x1)-f(x2) 0

So f(x) is an increasing function on (- b 2a).

I hope mine is helpful to you, o(o!

1.Represent the following sets of Toma in the appropriate way, and then say whether they are finite or infinite.

A set of all natural numbers greater than 10.

Solution: a=, it is an infinite set.

A set of all common divisors of 24 and 30.

Solution: b=, which is a finite set.

The solution of the equation x -4 = 0 is obtained.

Solution: x -4 = 0 x = 2 or x = -2

So: c=, it's a finite set.

2.Descriptively represent the following sets, and then say whether they are finite or infinite.

A set of all common multiples of 4 and 6.

Solution: a=, it is an infinite set.

A collection of all even numbers.

Solution: b=, it is an infinite set.

The solution of the equation x -2 = 0 yields a family combination.

Solution: c=, which is a finite set.

The solution set of inequalities 4x-6 5.

Solution: d=, which is an infinite set.

The second question is not sure, so some references about divisibility are provided for reference, and you can also refer to other answers, (*hehe......

1) There is no blank set of manuscripts.

2) Finite set.

3) Finite set.

1) Unlimited sets.

2){x|x=2k,k z] lead-free blind limit set.

3){x|x -2=0] finite set.

4){x|4x-6 5] Infinite set.

Don't care what the answer says, do you understand it by looking at the picture? Believe the answer, then you are no longer yourself!

Hope you understand my answer! Doing math graphics is a great tool!