![](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>)
() 10 = 0.8 = (): 25 = 24 / 7 + () = ()% Fast first to adopt
8 20 30 80
______ ：0.8=( )24=0.25=______ ÷12=______ %．
2:0.8 = 624 = 0.25 = 3 △ 12 = 25%. So the answer is: 0.2, 6, 3, 25
A number divided by 3, 6, 8, 5, all have 1. The minimum number is ()
3、6、8、5,
Minimum = 3 * 8 * 5 + 1 = 121
6.3 divided by (1 / 4-0.07 divided by 1 / 50) multiplied by 1 / 7 (process)
6.3÷（29/7-7/100÷1/50）*9/7
=6.3÷（29/7-7/2）*9/7
=6.3÷9/14*9/7
=6.3*14/9*9/7
=6.3*2
=12.6
2 / 5 times () = 2 / 3 divided by () = 9 / 5 times () = () divided by 5 / 6 = 50%
OK, extra points
2 / 5 times (5 / 4) = 2 / 3 divided by (4 / 3) = 9 / 5 times (5 / 18) = (5 / 12) divided by 5 / 6 = 50%
Which are prime numbers in 1,3,7,21
3,7 are prime numbers
21 is the sum
1 is neither prime nor composite
What are the prime numbers from 1 to 42
2、3、5、7、11、13、17、19、23 、29 、31、 37、 41
How much is four fifths minus two thirds plus five eighths?
4/5-2/3+5/8
=96/120-80/120+75/120
=91/120
Two and four fifths minus four fifths multiplied by eight and one minus nine tenths
Original form
=2 and 4 / 5-1 / 10-9 / 10
=2 and 4 / 5 - (1 / 10 + 9 / 10)
=2 and 4 / 5-1
=1 and 4 / 5
11 / 8 minus (4 / 5 minus 5 / 8) minus 1 / 5
Simple operation
=2-1=1
2 is the sum of eight denominators and 1 is the sum of two subtracted numbers
RELATED INFORMATIONS
- 1. Three out of seven minus two out of 21
- 2. There are 360 students in the sixth grade of a school, of which the number of boys is 80% of the number of girls. How many boys and girls are there respectively?
- 3. 1. The following is the number of each class in Grade 5 of Yucai primary school: Class 1: 39, class 2: 41, class 3: 40, class 4: 43, class 5: 12 Which classes can be equally divided into groups with the same number? Which classes can't? Why? 2. Fill in the blanks with prime numbers, which cannot be repeated: 18 = + = + = ++ 3. The difference between the minimum multiple of a number and its maximum factor is () 4. The quotient of the minimum multiple of a number divided by its maximum factor is () 5. If a natural number is smaller than 20, it is a multiple of 2 and has a factor of 7. This natural number is (). There are () factors for the difference of (); there are () factors for the product of a * B There are 42 students in class five
- 4. There are 94 students in the two classes of grade 6, including 39 girls. It is known that girls in class 1 account for 2 / 5 of the class and girls in class 2 account for 3 / 7 of the class, How many people are there in the two classes Wrong number. How many people are there in each class
- 5. Can you see from the following two figures which school has more female students? Why? School a: male: 50%, female: 50% School B: male: 60%, female: 40%
- 6. There are 540 students in the fifth grade of experimental primary school. The number of boys is 1.2 times that of girls. How many boys and girls are there respectively?
- 7. Master Wang planned to process 120 parts today. In fact, he processed 7 / 12 of all the parts in the morning, 38 in the afternoon and 42 in the evening. That's a big deal How much of the task did Master Wang overfulfill on that day?
- 8. The school assigned 540 tree planting tasks according to the number of students in three classes of grade 6. There were 44 students in class 1, 45 students in class 2 and 46 students in class 3. How many trees should be planted in each of the three classes?
- 9. Miss Liu took some money to buy exercise books Mr. Liu took some money to the store to buy some exercise books, but it happened to be on sale. This exercise book was sold at a 20% discount. In this way, the money Mr. Liu brought could just buy 50 more exercise books than before. The original price of the exercise book was 2.5 yuan. Please calculate how much money Mr. Liu brought. It's better not to use the solution equation
- 10. Mr. Wang bought prizes for 15 excellent students at a total cost of 66 yuan, 4 yuan for each notebook and 5 yuan for each pen. How much did Mr. Wang buy
- 11. How to calculate 734-398 with simple algorithm
- 12. 2007 minus 2008 =?
- 13. 7.3 divided by 4 + 2.7 multiplied by 0.25, the reason is not obvious
- 14. () / () = 0.4 = fraction 4 = fraction 25 = fraction 36
- 15. 8 divided by 3.5
- 16. When the number of hydrogen atoms in the solute and the solvent is equal, the mass fraction of the solute in an aqueous solution of C2H5OH is () A. 23%B. 46%C. 55%D. 72%
- 17. When a bottle is filled with water, the total mass of water and bottle is 120g. When it is filled with alcohol, the total mass of alcohol and bottle is 100g. What is the mass of alcohol in the bottle? What's the mass of the bottle? (ρ alcohol = 0.8 × 103kg / m3)
- 18. 1、 There are two kinds of alcohol with 85% and 45% concentration. Now we need to prepare 400 grams of alcohol with 60% concentration
- 19. A. B two kinds of wine contain 75% and 55% alcohol respectively. Now we need to prepare 3000 grams of wine with 65% alcohol. How much should we take from each of the two kinds of wine?
- 20. In the experimental class, a junior high school student should prepare 2000 grams of 80% alcohol solution into 60% alcohol solution. Without consideration, a student added 500 grams of water. (1) try to explain whether the student added too much water through calculation; (2) if the amount of water can not be added, how many grams of 20% alcohol solution should be added? If the amount of water is excessive, how many grams of 95% alcohol solution should be added?