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What is the sum of 5 / 3 and 19 / 21? How much less is 5 / 8 of 2.12 than 2 / 3 of 21? There are seven fourths behind the and
1、5/3+19/21=54/21=18/7;
2、21*(1/3)-12*(5/8)=7-15/2=-1/2;
How much is 2 / 3 of 1 / 2? How much is 2 / 5 of 5 / 6 of 24? How much is 1 / 5 of 15 less than 4 / 5 of 15?
How much less is 1 in 13 of 26 than 7 in 11 of 121?
1 / 2 × 2 / 3 = 1 / 3; 24 × 5 / 6 × 2 / 5 = 8; 15 × 1 / 5-15 × 4 / 5 = - 9 less than 9; 26 × 1 / 13-121 × 7 / 11 = - 75 less than 75
Formula calculation: ① 23 of a number is 60, what is 79 of the number? ② 13 times of a number is equal to 57 of 45, find the number
① A: this number is 70. ② let this number be x; & nbsp; & nbsp; & nbsp; 13X = 45 × 57 & nbsp; & nbsp; & nbsp; 13X = 4713x △ 13 = 47 △ 13 & nbsp; & nbsp; & nbsp; & nbsp; X = 127. A: this number is 127
Xinxin business service company charges 3% service fee for selling goods for customers and 2% service fee for purchasing goods on behalf of customers. Today, a customer entrusts the company to sell some self-made goods and purchase new equipment on behalf of customers. It is known that the company has deducted 264 yuan of customer service fee. The customer just wants to make ends meet. How much has the new equipment cost?
From the analysis, it can be concluded that: the price of goods sold is × 3% + the price of equipment purchased is × 2% = 264; that is, the price of equipment purchased is 10297 × 3% + the price of equipment purchased is × 2% = 264264 △ (10297 × 3% + 2%) = 5121.6 yuan; a: the price of equipment purchased is 5121.6 yuan
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- 1. Math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math math What is the concentration of salt water after mixing 500 g of 70% salt water and 300 g of 50% salt water? 30 kg of 25% salt water should be diluted into 6% salt water, It is known that if the salt water is kilogram, the concentration of salt water becomes 3% after adding a certain amount of water for the first time, and 2% after adding the same amount of water for the second time? The concentration of a and B alcohol is 70% and 55% respectively. Now, to prepare 3000 grams of 65% alcohol, how many grams should be taken from each of the two kinds of alcohol? A. We know that a is one-half of the sum of the other three numbers, B is one-third of the sum of the other three numbers, and C is one-quarter of the sum of the other three numbers?
- 2. Number multiplication learning is equal to the number of number words: number () word () learning ()
- 3. If you add a percentage sign to a number, the number will be reduced by 29.7______ ．
- 4. A number will be increased by 19.8 after the percentage sign is removed?
- 5. Adding a percent sign to a number reduces it by 9.9%, which turns out to be ()
- 6. The four numbers 1, 2, 3 and 4 can be used to form many four digit numbers without repetition. What is the sum of all these four digit numbers? Write the formula (preferably comprehensive), the answer, fast! Kneel down for the answer!
- 7. Use numbers 0, 1, 2, 3 and 4 to form numbers without repeating numbers. (1) how many five digit numbers can be formed? (2) how many odd five digit numbers can be formed? (3) how many positive integers can be formed?
- 8. Use the numbers 0,1,2,3,4,5 to form a number without repetition 1: How many 6 digits can be made up 2: How many natural numbers larger than 300000 can be formed 3: How many four digits can be made up that are multiples of 25 We need to calculate the process
- 9. 3 and 4 / 5-2.7 = 1 / 5 of the number a is equal to 1 / 6 of the number already counted, the number a is 90, and the number already counted is () One ninth of an eight kilogram is as heavy as one eighth of a nine kilogram () right or wrong
- 10. 12 of a number is 90 more than 13. This number is______ ．
- 11. Five times of a number is 80. This number is two times more than seven times of another number?
- 12. Formula calculation: [1] the product of 0.12 and 80 divided by a number, the quotient is 0.5, find this number. [2] five times of a number minus 7 / 9, get 2 / 9, find this number One half, one sixth, one twenty-four, () () () [2] three fourths less than () less than () less than () four fifths [3] one percent plus two percent plus three percent plus... Plus ninety-nine percent equals ()
- 13. 6 / 5 of a certain number is more than 3 / 4 and 1 / 3. What is the number
- 14. Three classes of grade 6 donated money for "Hope Project". The donation amount of class 1 was 2 / 5 of the donation amount of the other two classes, and the donation amount of class 2 was 2 / 5 of the donation amount of the other two classes 3 / 7. It is known that class 3 donated 145 yuan. How much did the three classes donate?
- 15. The average score of Xiaohua's previous math tests was 80 points, and this time he got 100 points, which just raised the average score of these tests to 85 points?
- 16. A class mathematics test 60 to 70 points, 5 people 70 to 80 points, 8 people 80 to 90 points, 15 people 90 to 100 points, 12 people ask what percentage of the total number of students with 80 points or more? What percentage of the total number of students with 70 to 80 points or more?
- 17. The results of a language test in a class are as follows: 7 students scored 100, 14 students scored 90, 17 students scored 80, 8 students scored 70, 2 students scored 60, and 2 students scored 50 Calculate the average score of the class in this test.
- 18. How many chickens and rabbits are there each? How many are there
- 19. There are several chickens and rabbits in the cage. There are 46 heads from the top and 128 feet from the bottom. How many chickens and rabbits are there? (two methods) urgent! Equation and formulation. Please, every step, don't miss
- 20. In a cage, the number of chickens and rabbits is equal. There are 48 in total. How many chickens and rabbits are there? The school has 26 pairs of chess and checkers, which can be used by 120 students at the same time. Two students play chess and six students play checkers. How many pairs of chess and checkers are there?