![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The formula of addition and subtraction of rational number in grade one mathematics of junior high school!
Addition:
① Positive number + positive number = positive number
② Negative number + negative number = negative number
If the absolute value of a positive number is greater than that of a negative number:
③ Positive + negative = positive
If the absolute value of a positive number is less than that of a negative number, then:
④ Positive + negative = negative
Subtraction:
① Positive (large) - positive (small) = positive
② Positive (small) - positive (large) = negative
③ Positive negative = positive
④ Negative - positive = negative
⑤ Negative number (large absolute value) - negative number (small absolute value) = negative number
⑥ Negative number (small absolute value) - negative number (large absolute value) = positive number
Note: the absolute value is to change the sign in front of the number to a positive sign
The absolute value of - 1 is 1
-The absolute value of 123 is 123
Determine the sign, and then use the large absolute value, minus the small absolute value (regardless of before and after), and then add the sign
RELATED INFORMATIONS
- 1. What is the rule of comparison of rational numbers?
- 2. Division of rational numbers There are two ways to divide rational numbers 1. Divided into integer and fraction 2. Divided into positive rational number, 0, negative rational number Title: Can you make your own standard to classify rational numbers in another way? We often classify things in our life. Please give an example I'll wait online!
- 3. As shown in the figure, three rectangles of the same size just make a square. The perimeter of the square is 48 cm. Find the perimeter of each rectangle In the following figure, three rectangles are stacked horizontally
- 4. Given x = 84, y = 2.56, find x + Y-2 radical XY / radical x-radical y,
- 5. How to find the partial derivative of X to the power of X to the power of Y I'm not very good at finding partial derivatives for X and y, but I always get a small part Z = x ^ x ^ y finding partial derivatives of X and Y
- 6. How to calculate addition, subtraction, multiplication and division is equal to 24
- 7. It is known that (- 5, Y1), (3, Y2) is a linear function y = - 1 / 3x + 2, and the relationship between Y1 and Y2 is
- 8. Use 3 4 - 3 - 5 to calculate 24 points
- 9. It is known that the parabola y = AX2 + BX is tangent to the straight line x + y = 4 in the first quadrant. The area of the figure enclosed by the parabola and the x-axis is denoted as S. find the A and b values that make s reach the maximum value, and find the maximum value of S
- 10. It is known that the height of a prism with a square bottom is 7cm, and the side length of a square is 4cm. Find the sum of the lengths of all the edges and the surface area
- 11. Mainly to the first day of the calculation problem ~ to have add subtract multiply divide power~
- 12. 3-What fraction is zero?
- 13. How many parts is 0.625 times one third
- 14. What fraction is equal to 0.625 is equal to 48 is equal to 25 divided by what
- 15. 6 out of 15 is equal to a fraction, 30 out of 15 is equal to a fraction
- 16. 30 hectares is equal to a few parts of a square meter
- 17. Two fifths of fifteen is equivalent to what fraction of thirty? 2. The ratio of 4 / 5 to 1 / 8 to the simplest integer is (), and the ratio is ()
- 18. A simple method of multiplying 0.4 by 1.34 by 2.5
- 19. How to simplify the problem of 0.25 to 3 / 16
- 20. What is 2 divided by 0?