The basic starting point of the subject of mathematics in primary school is:

In my opinion, there are four basic starting points for the subject of mathematics in primary school:

1. Cultivate the basic numeracy ability of primary school students;

2. Initially cultivate the ability of primary school students to analyze and solve problems;

3. Cultivate the good thinking quality of primary school students;

4. It is the primary school students who form a preliminary spatial concept.

These four points should also be the foothold of primary school mathematics.

Cultivate students' imagination skills and help students understand memory in connection with real life.

Basic math knowledge, figuring out concepts is the main thing.

With thinking training as the core, it is closely related to the reality of life.

Develop children's logical thinking skills.

Use real life to let children know, know and understand mathematics.

Think about it in relation to the reality of life.

Promoting the continuous, holistic and harmonious development of students is the core concept of the new curriculum standards.

Everyone learns valuable mathematics.

Everyone has access to the mathematics they need.

Different people develop differently in mathematics.

Cultivating Students' Thinking and Communication Skills The most important thing is to educate people.

The basic knowledge should be good, mathematics should be relevant to real life, and the most important thing is to guide the transformation of students' thinking and cultivate children's logical thinking ability.

Cultivate good study habits in students.

Computational and mathematical thinking development.

Mobilize students' thinking ability, let them feel mathematics from reality, and slowly sublimate it into the essence of mathematics.

In elementary school, you should cultivate numeracy ability, problem reading ability, mathematical thinking and enthusiasm for learning Children are still more playful.

Mathematics is a science subject that grows up to play a role in science, engineering, medicine, and economics.

Cultivate children's numeracy, analytical and problem-solving skills, geometric thinking skills, etc.

Let students know some basic math knowledge and teach the basics of math.

Everyone learns useful mathematics.

It is most effective to develop the child's thinking and let him take the initiative to learn.

Learning mathematics in life can master some useful knowledge.

Learn the basics and solve elementary practical problems.

Basic knowledge and basic skills, and then there are mathematical ideas.

Learn while understanding, and remember the deep understanding firmly!

Learn to use mathematics to solve problems in life.

Develop number sense and divergent thinking.

Learn about mathematics in real life.

The most important thing is attitude. It is recommended that if you like mathematics, hurry up and learn Olympiad mathematics, and junior high school must not be interrupted. You have to figure out every question in primary school mathematics, and ask teachers and classmates if you don't understand. You don't know what math is until you're in high school! Come on!

I think elementary school really doesn't matter. This classmate, rest assured and have fun. When you go to junior high school and high school, you know that you can't use that little thing in elementary school, and you can use 1234 at most. So, as long as you learn addition, subtraction, multiplication, and division, it's OK.

Really, listen to a word of advice from someone who has come before!! Tears run,,Eh, there's a lot of homework in middle school.。。。

Question 1, commutative law of addition: the addition of two numbers to exchange the position of the additive, and the sum is invariant.

1.Count.

2. Practical questions. 3 Simple geometry.

1. Score calculation.

2. Decimal calculation.

3. Percentage.

Be flexible and conscientious in your work.

When opening the parentheses, just look at whether the symbol in front of the parenthesis is + or - 1) if it is +, all the symbols in the parentheses do not change the sign, (2) if it is - all the symbols in the parentheses are reversed, that is, + changes -,- changes +. For numbers that are not preceded by plus or minus signs, such as 666 in the example, they are preceded by a + sign.

After determining the plus and minus signs, just use the distribution rate. For the parentheses before the multiplication and division sign, the multiplication sign is equivalent to the plus sign just now, the division sign is equivalent to the minus sign just now, when it is a multiplication sign, the invariant sign in the parentheses, when it is the division sign, the change sign in the parentheses, the brackets without a sign are regarded as multiplier signs, such as 10 (2*5) = 10 2 5 = 1, the 2 in parentheses is preceded by a multiplication sign, 2*(6 3) = 2*6 3 = 4, and the unsigned 6 in parentheses is regarded as a multiplication sign.

In addition, multiplication and division is reversed: dividing by a number is equal to multiplying by the reciprocal of this number, or multiplying by a number is equal to dividing by the reciprocal of this number. Let's say six divided by 3 equals six times one-third, and 3 times 2 equals three divided by one-half.

The example of the landlord is exactly right!

1. If the parentheses are preceded by a minus sign, the plus sign becomes a minus sign, and the minus sign becomes a plus sign, such as -(x-y)=-x+y;

2 If the parentheses are preceded by a plus sign, the sign is unchanged, such as (x+y)=x+y.

3. If the parentheses are preceded by plus or minus signs, the multiplication and division signs in the parentheses are all unchanged.

4 If it is a multiplication sign, then the multiplication distribution property is used, such as a (b+c)=ab+ac; The parentheses must be plus or minus signs, and if it is a multiplication and division sign, it can be seen as no parentheses.

5. If the parentheses are preceded by a division sign, then count the brackets first, and then divide, such as a (b+c), first calculate the value of b+c, and then divide by a. If there is a multiplication and division sign inside the parentheses, then the multiplication is divided and the division becomes.

Additional answer: 666x(665a+1)-665x(666a-1) can be converted into (666x665a+666)-665x666a+665 can be changed like this.

1.The parentheses are preceded by a minus sign, and after the brackets are opened, the sign should be changed (if there is a minus sign in the parentheses, the minus sign should be added; If it's a plus sign, change the plus sign to a minus sign).

If the parentheses are preceded by a plus sign, then the parentheses are opened without changing the sign.

For example: 10-(5-3)=10-2=10-5+3=8 10-(5+3)=10-8=10-5-3=2

2.If the parentheses are preceded by a division sign, the parentheses are opened and multiplied to divide; If the previous multiplication number is used, the number will not change.

You're just starting out, right? When I first started learning, it was a bit confusing, and I was a little confused when I first started elementary school, but it got better quickly. As long as you memorize the above two sentences, do some exercises or contact more topics, and become familiar with it, you will naturally be able to o( o,,, I believe you will soon master it!!

This 666x(665a+1)-665x(666a-1) can be converted to (666x665a+666)-665x666a+665

You can look at it separately: 666x(665a+1) uses the multiplicative distribution rate ax(b+c)=ab+ac, which is this (666x665a+666), and then you treat this as a whole and ignore it; Then you look at this -665x(666a-1), the minus sign in front of it doesn't move, first multiply 665 into the parentheses and become -(665x666a-665), and then just follow the change sign method I said before ok o( o

You're a pretty divergent thinker......\o^)/~

It's okay for the landlord to change like this, and the bracket in front of it is better to remove it, because it's redundant!

The order of our operation is to first multiply and divide the parentheses, and then add or subtract the parentheses, when they can be removed, and when they can't be removed, depending on the symbol before the parentheses. If it is preceded by a minus sign, the parentheses should be changed. If the front is multiplication, the multiplication distribution rate is used to disassemble it, just like the problem written by the landlord himself.

If the preceding is division, then you must calculate the parentheses first, not the same as the multiplication distribution rate!

This kind of thing is difficult to explain clearly here, the landlord must practice more and ask more questions, in order to figure it out, I wish you progress in learning!

For example, 10-(5-3)=8 is 10-5+3=8 when opened in parentheses, that is, negative and negative are positive (minus -3 is plus 3, and minus +5 is minus 5).

Similarly, in multiplication and division, division is multiplication, and the semicolon of the fraction is also a kind of division sign, and for example, 10 (5*2)=1 is 10 5 2=1 10*(8 4)=10*8 4 do not change.

If you think about it for yourself, it's easy to figure it out.

The parentheses are preceded by a minus sign, and the addition and subtraction in the parentheses must be reversed.

Multiplication and division are invariant, they are not the same level of operation.

The parentheses are preceded by a division sign, and the multiplication and division in the parentheses must be reversed.

Addition and subtraction are constant, they are not the same level of operation.

-(5-2)=-5+2 means that when there is a - sign before the parentheses, the numbers in the parentheses are all changed, and the positive ones are not used. Multiply by an equal and divide by the reciprocal of this number, e.g. 50 times 20 = 50 divided by 1 20. If you don't know how to add 1150087654, I'll teach you.

I'm a freshman in high school this year, and this pediatric feeling is fine. Someone upstairs was wrong.

The parentheses are preceded by a plus sign, and the symbols inside the parentheses remain unchanged.

The parentheses are preceded by a minus sign, and the plus sign inside the parentheses becomes a minus sign, and the minus sign becomes a plus sign.

The parentheses are preceded by a multiplication sign, and the symbols in the parentheses remain unchanged.

The parentheses are preceded by the division sign, and the multiplication sign inside the parentheses becomes the division sign, and the division sign becomes the multiplication sign.

You question the supplement that did it right.

What about the question of +,—.

The parentheses are preceded by a plus sign, and the parentheses are removed without the same sign.

The parentheses are preceded by a minus sign, and the parentheses are removed to change the sign.

Multiplication to division, is there this? Elementary school.

For example, —665x(666a-1) becomes —(665 x 666a - 1 x 665).

After that, just add or subtract as you would.

1. If the parentheses are preceded by or , all the symbols in the parentheses do not need to be changed, that is, they do not change.

2. Before the brackets are —, then the change in the brackets —,— change, and before the brackets is , then the brackets change and change.

When there is a minus sign in front of the parentheses, open the parentheses to subtract from addition, and open the parentheses to change from division when there is a division sign in front of the parentheses.

It's okay to do that.

For example: 50-(25+24)=1

The point of attention is whether the desired answer should be negative, and the size of some substances cannot be negative (e.g., times).

When there is a + or * outside the parentheses, there are no changes in the open parentheses.

Conversely, when the outside of the parenthesis is -, the inside of the open parenthesis is changed.

Positive is positive, negative negative is positive, positive negative is negative.

It's all positive, - it's all negative.

Before the parentheses are - change the addition to subtraction, change the decrease to add and divide before the parentheses are the division signs, then the multiplication is divided, and the division is multiplied.

The parentheses are preceded by a negative number multiplied by them.

That conversion was right.

The - sign can be seen as -1, for example.

x+y)=(-1*x+(-1)*y)=-x-y

Isn't it nice that you're doing this, and that's the right conversion.

Of course.

The multiplication distribution rate ax(b+c)=ab+ac is sufficient.