Practical real life applications of rational number addition, subtraction, multiplication and divisi

These are the basics, everyone will be surprised or praise you if you know it, but if you don't know, it can only show that you are ignorant!

I personally believe that the practice of junior high school math problems is more important for the development of intelligence than its practical application. Because mathematics is an abstract thing, it's not like whatever, it's a digital phenomenon in life. The fundamentals are not for practical application, but rather for the basis of learning more in-depth applied knowledge.

It's like you can't make a fire, so you can't eat cooked food. And if your dream is to be a vegetable or fruit seller (not to despise this industry), as long as you are proficient in oral arithmetic, addition and subtraction, you are qualified. But if you want to be a designer, whether it's engineering or clothing, etc., you don't know what linearity is, you don't know the arc, the angle, can you still work?

As a junior high school student, you can't position yourself for your future career, so you need to master the basic knowledge to have the opportunity to pursue higher education and learn practical skills.

In China's education system, basic education takes too long and does not focus on cultivating creativity and open-mindedness. Skill orientation is also after college, and in fact, the employment of fresh graduates from 2010 to 2012 has a consistent rate of less than 70% (incomplete statistics, I also see).

If you want students to raise their interest in learning mathematics, I personally feel that it is still a matter of teaching method (I like mathematics very much, so I am willing to do all kinds of math problems), equations, factorization and other types, find more simple methods and multi-category solutions for students, and solve multiple problems in one problem; Functions, equations, find some practical or interesting problems; Triangle is the foundation, if students don't have three-dimensional thinking, they will be very disgusted with geometry.

In short, it's all the basics, and it's important to start your interest well. Personal opinion, hope it helps!!

Negative numbers are mainly used in philosophy and chemistry, and you should know anything else

This is the foundation, but in fact, it really won't be of much use in the future! But I think this is a test of people's learning ability, and you can train your learning ability when you are young, and you can't stop learning because you don't like it. It's also a test of your temperament!

In the future, whether it is school, social circle or workplace, your temperament is the key!

Grade 7 Rational number calculation questions.

Addition of rational numbers.

Rational numbers clear Kai subtraction.

Multiplication of rational numbers.

Division of rational numbers.

3 ( 0 (3) (7) 3 ( Answer ( 24) (6) 5. Mixed operation of rational numbers.

15 (1 1 3 (1) 5) 5 (5 (Shirt).

If a negative number is greater than a positive number, the result is a negative number, for example: 5+(-9)=-4 is equivalent to 5-9=-4

The sum of two negative numbers equals a negative number, for example: -5 + (-9) = -14

Add two numbers of the same sign, take the same symbol, and add the absolute value of the two numbers of the different sign, take the sign with the larger absolute value, and subtract the smaller absolute value from the larger absolute value.

Addition: Take the additive sign with the larger absolute value, and subtract the number with the larger absolute value from the number with the smaller absolute value.

Subtraction: Subtracting a number is equal to adding the opposite of the number.

Read the textbook carefully and understand it carefully. That's how I came here.

Grade 7 Rational number calculation questions.

Addition of rational numbers.

Subtraction of rational numbers.

Multiplication of rational numbers.

Division of rational numbers.

5. Mixed operation of rational numbers.

-13×

Two-thirds seven-two-thirds + one-thirds du

zhi(-13)-5/7 dao*

13 Edition 2 3 -13 1 3 -5 7 = -13 (2 3 + 1 3).

2 3 4 5) (one-half power - one-third - quarter + fifth) = (2 3 4 5) (1 2-1 3 -1 4 +1 5) = (2 3 4 5) (1 2) - (2 3 4 5) (1 3) - (2 3 4 5) (1 4) + (2 3 4 5) (1 5).

If you answer these questions, it seems that you will be rejected!

It's something wrong with the subtraction of rational numbers... The abbreviation won't forget it, maybe I'm stupid.

1. If a snail climbs to the right.

A row of 2cm is denoted as +2cm, then a crawl of 2cm to the left should be denoted as .

2. If after 3 minutes is recorded as +3 minutes, then 3

minutes ago should be written as .

Question 1: If the snail keeps crawling from point o to the right at a speed of 2 cm per minute, after 3 minutes it is at the edge of point o cm?

1) (3) 9 case 2:

The amount of change in temperature is expressed as a positive and negative number is used, the rise is positive, the fall is negative, and the mountaineering team climbs a mountain, each time they ascend.

The change in temperature for 1km is 6 0C, what happens after climbing 3km?

The store sells a certain item at a reduced price, 5 yuan per piece, and after 60 pieces are sold, the same quantity is sold at the original price.

How has the sales changed compared to the product?

Let's refer to it slowly.

1. Dismantle fiber 7 =

2. The reciprocal of -7 is.

The approximate number of 519 accurate to the percentile is.

4. Calculation: (1) 2006=

6. The inverse of 5 is.

7. It is expressed by the scientific orange notation: 457100 = 8, and the number represented by the point whose distance from 1 to the point representing 1 is equal to 3 on the number axis is.

9. If x 2 = 4, then x =

11. Compare size: 3 2

12. If x = 4 is the solution of the equation ax 2x = 4, then a =