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The multiplication sign between two identical letters can not only be omitted, but also be written and read. What is the meaning?
The dot "·" is used to indicate the multiplication sign when the letters are multiplied,
You can't write that between numbers
The multiplication of two identical letters A and a can be written as follows:
a×a ,a·a ,aa,a²
It's a times a, or the square of A
The multiplication sign between letters or between letters and numbers can be marked as "·" or ()
The multiplication sign between letter and letter, between letter and number can be marked as "·" or (omitted)
The multiplication sign between letters can be replaced by a dot. Can it be between numbers and letters or between numbers and numbers?
Numbers and letters can be separated
There is no difference between numbers
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- 1. Can I write the letters before the numbers when I use the dot multiplier? Why?
- 2. In general, when a number is multiplied by a letter, the multiplication sign can be omitted. For example, 3 × A is written as 3a. How to read 3A? Is it 3 times a or 3A
- 3. Use 13, - 5, - 3,7 to make the result 24 and write the formula
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- 5. 1. The stock of white paper in a store is twice that of red paper. If 300 pieces of red paper and 400 pieces of white paper are sold out every day, after a few days, there are 1400 pieces of red paper left. How many pieces of white paper are in stock? Twenty years ago, my father was six times as old as Xiaoling. Today, my father is two times as old as Xiaoling 3. The ratio of the number of young pioneers of team a and team B is 7:3. If 30 people are transferred from team a to team B, the ratio of team a and team B to admit defeat is 3:2. How many people are there in team B? 4. The distance between a and B is 340km. Two buses a and B start from two places at the same time and travel opposite each other. After four hours, a and B meet. It is known that the speed of a and B is 8:9. What is the speed of B?
- 6. 1. To transport a batch of goods, 14 tons more than the remaining 1 / 3, and the ratio of the remaining to the shipped is 2:3. How many tons are there in total? 2. The ratio of goods in warehouse A to goods in warehouse B is 6:5. The goods in warehouse C are 1 / 3 less than those in warehouse B and 320 tons less than those in warehouse A. how many tons are there in warehouse B? 3. A factory processes a batch of parts and gives them to Party A and Party B according to the ratio of 3:5, and then gives the rest to Party A and Party B equally. Party A gets exactly 1 / 15 of his first share? (please tell me why I solve the problem in this way, and I will reward points)
- 7. A cuboid container, measured from the inside, is 6 decimeters long and 4 decimeters wide, and a cylindrical container, measured from the inside, has a bottom area of 8 square decimeters and a height of 6 decimeters. Fill the cuboid container with water and pour it into the cylindrical container. When the water in the cylindrical container is several decimeters high, the water in the two containers is the same?
- 8. What is 1 + one third + one sixth + one tenth + one fifteenth + one twenty-one Come on
- 9. 28:49 (reduction ratio)
- 10. Rational numbers can be divided into positive numbers, negative numbers and 0, or positive numbers and fractions. According to what are these two kinds of fractions? For example, by concept, by meaning and so on,
- 11. X × y =? Omit multiplier sign
- 12. Omit the multiplication sign and abbreviate the following expressions a × t m × n
- 13. Omit the multiply sign. A times 2 times B
- 14. 7 * 7, how to omit the multiplication sign?
- 15. Take 1, 2, 3 and 4 and arrange them in a row from small to large. Insert a multiplier sign between these four numbers to get () different products This is a difficult math problem
- 16. Numbers and algebraic expressions and equations (2) there are filling in the blanks and practical problems, within 10 minutes (multiplier sign: ×, division sign: △) Fill in the blanks: 1. Read a book, N pages a day, () 100 pages a day Xiao Xia is x years old and her father is (x + y years old). Ten years later, her father is () years older than Xiao Xia Fill in the blank ③ when m = 5, 5m = (), 5m + 1 = () There is a book. Xiaohua read 25% of it on the first day and one third of it on the second day. There are 120 pages left. How many pages are there in this book? There are 50 passengers on the bus. According to the conductor, the income of 1 yuan is 20 yuan more than that of 1.5 yuan. How many passengers buy 1.5 yuan tickets?
- 17. Fill in addition, multiplication, division, addition, subtraction and brackets to get the following answer. 123456 = 5
- 18. Some problems about arithmetic of significant number Is the operation process of 8.0421 / (6.038-6.034) + 30.9 like this?: 6.038-6.034 = 0.004 8.0421/0.004 = 2205.25 (since the least significant digit is one, the result should also retain one significant digit, so the original formula is about 2 * 10 ^ 3? So it can be added to 30.9. According to the highest suspicious digit, is the result still 2 * 10 ^ 3? There is another problem, Is the approximate number of 2205.25 taken first and then added by 30.9, or is the approximate number of 2205.25 and 30.9 taken first and then added by 30.9?
- 19. It can't be replaced by X. it can only be replaced by ordinary multiplication, division, addition and subtraction,
- 20. Multiply a number by 10, the number is 36 more than the original number, the original number is []