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What are positive and negative numbers
If a number is greater than zero (> 0), it is said to be a positive number. A positive number can be preceded by a positive sign "+". There are countless positive numbers, including positive integers, positive fractions and positive irrational numbers. Any positive number preceded by a negative sign is equal to a negative number. A negative number is smaller than zero
The meaning of positive and negative numbers
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Don't think about the number axis. In fact, positive and negative numbers are two opposite directions
For example, if Xiao Ming takes three steps to the East and then five steps to the west, what is the distance and direction from the far point?
If the east direction is positive, the west direction is negative, and 3-5 = - 2. This - 2 describes both distance and direction
If a positive number indicates an increase, a negative number indicates a decrease
There are positive and negative figures everywhere in our life, such as paying for things, refunding more and making up less
What's the point of positive and negative numbers
Mathematics serves for physics. Positive and negative in physics can indicate direction
Give a pair of quantities with opposite meanings and express them with positive and negative numbers respectively______ ．
For example, if you move 2 meters to the East, it will be recorded as + 2 meters, and if you move 2 meters to the west, it will be recorded as - 2 meters (the answer is not unique). Therefore, the answer is: if you move 2 meters to the East, it will be recorded as + 2 meters, and if you move 2 meters to the west, it will be recorded as - 2 meters (the answer is not unique)
Give several pairs of (at least two) quantities with opposite meanings and express them with positive and negative numbers respectively
Go from life to death
What is the meaning of quantity expressed by positive and negative numbers
If the rise is positive, the fall is negative
What is the meaning of the specific quantity represented by positive and negative numbers?
Such as the title
The distance from the point on the positive number axis to the origin
The opposite number of the distance from the point on the negative number axis to the origin
The concept of positive and negative numbers in grade five
A number greater than zero is called a positive number
A number smaller than zero is called a negative number
What is the meaning of positive and negative numbers
A positive number is a number greater than zero, and a negative number is a number less than zero
How to calculate positive and negative numbers? Do you have any concept? We will have a monthly exam tomorrow
1. Remember that negative can be positive, only 1,3,5,7 odd negative result is negative
Good luck on your exam!
RELATED INFORMATIONS
- 1. The definition of finding positive and negative numbers
- 2. How does the following formula deform? From C ^ 2 + 4b-4c-12 = 0 to 4 (4-b) = (C-2) 2 How do you get the second formula?
- 3. Class did not learn! Especially the map, the most headache! There are some junior high school knowledge is also more dizzy! Four. Point about line, line about point, point about point, line about line
- 4. First simplify, then evaluate: B ^ 4 + (- a-b) (- A + b) (a ^ 2 + B ^ 2), where: a = - 1, B = 2011
- 5. One square meter =? Square centimeter? Square decimeter?
- 6. 0.03 square decimeter = () square centimeter = () square meter
- 7. A cuboid is 1.4 m long, 5.0 m wide and 5.0 M high______ Each face is a square, and the area of each face is______ Square decimeter
- 8. How many decimeters is one meter and how to calculate it? A cuboid steel plate, 1.5 meters long, 0.8 meters wide, 15 cm thick. 1. How many cubic decimeters is its volume? 2. Each cubic decimeter of steel plate weighs 2.4kg. How many kg is the weight of this steel plate?
- 9. The cover area of this book is about 5 () A. square meters B. square decimeters C. square centimeters Hurry!
- 10. A square with a side length of () has an area of 1 square decimeter. A square with an area of () has a side length of 1cm
- 11. The term without y in the expansion of (2y-1 / y) square 8 is? What's the number
- 12. The length of a rectangle is 3 / 5 decimeters, its perimeter is 2 decimeters, what is its width
- 13. The school has a rectangular test field. If the length or width of the test field increases by 9 meters or 3 meters, the area will increase by 54 square meters The school has a rectangular experimental field. If the length of the experimental field increases by 9 meters or the width increases by 3 meters, the area will increase by 54 square meters. Do you know the area of the original experimental field? Please answer quickly! Wealth reward 10
- 14. The ratio of width to length of a rectangle is 2:5, the ratio of width to length is 12 square decimeters, and the area of the rectangle is () square decimeters In five minutes, it will be handed in tomorrow! 1. As shown in the figure, in two identical rectangles, the area of the shadow part is (). 2. The area of the object () or the plane figure () is called their area. 3. Cut out the largest circle in a square with an area of 8 square centimeters, How many square centimeters is the area of a circle? 4. The perimeter of a rectangular parking lot is 128 meters, the width is three fifths of the length. How many square meters is the area of this rectangle?
- 15. The lawn in the park is a rectangle, 43.5 meters in width and 1.5 times in length. What are the perimeter and area of this rectangle?
- 16. If the length of a rectangle is reduced by 1.5 meters, or the width is reduced by 1.2 meters, the area will be reduced by 6 square meters I'll give you extra points tonight. I'm not waiting
- 17. The area of a rectangular vegetable plot is 180 square meters. Its width is 12 meters. How many meters is its length
- 18. As shown in the figure, the length of a rectangular green space is unchanged, and the width is increased to 27 meters. What is the area of the expanded green space in square meters?
- 19. Build a rectangular pool, length 27 yuan per meter, width 35 yuan per meter, length and width integer budget 1000 yuan for the maximum area
- 20. If the width of a rectangle remains unchanged, its length increases by 8 meters and its area increases by 72 square meters; if the length remains unchanged and its width decreases by 4 meters, its area decreases by 48 square meters. Then the original area of the rectangle is () square meters A. 100B. 108C. 180D. 200