What does 3A + B mean Let's talk about it with our own reality

What is the sum of three times a and B

RELATED INFORMATIONS

1. 3A = half B, a: B = (): ()
2. Give examples to illustrate the meaning of the following algebraic formula: 1) 3a-b: (2) π a ^ 2: (3) x ^ 2-y ^ 2: (3) x + y + Z / 3:
3. A commodity is priced at 50% profit and then sold at a 10% discount. As a result, each commodity makes a profit of 20 yuan. What is the cost price of this commodity? West West
4. If the price of a commodity is increased by 20% according to the cost price, if the commodity is sold at 10% discount and the selling price is 270 yuan, how much is the cost of this commodity? (calculated by equation) How many hectares is a rectangular field 280m long and 250m wide? If 960kg cotton is produced per hectare, how many kg cotton can be produced? (calculated by equation)
5. A commodity is marked at a price of 20% higher than its cost price, and then sold at a 10% discount. The profit of each commodity sold is 20 yuan. What is the cost price of this commodity?
6. The price of a commodity is increased by 20% according to the cost price, and then it is sold at a 10% discount. The price is 270 yuan. What is the cost price of this commodity______ Yuan
7. A commodity is priced at a 25% profit, and then sold at a 10% discount. As a result, each commodity makes a profit of 20 yuan. How much is the cost of this commodity?
8. A commodity is priced at a 25% profit, and then sold at a 10% discount. As a result, each commodity makes a profit of 20 yuan. How much is the cost of this commodity?
9. A product is priced at 20% profit, and then sold at a 20% discount. As a result, each product loses 36 yuan, and the cost price is calculated Come on!
10. A commodity is priced at 15% of the profit, and then it is sold at a 10% discount. As a result, each commodity still earns 70 yuan. How far is the cost price of this commodity?
11. The beam is marked KL-6 (3a). Does 3A represent 3 spans or 4 spans?
12. For rational numbers a and B, define the operation a △ B = 3A + B / a-3b, calculate: (- 2) △ [7 △ (- 6)] Don't use functions
13. What is the * sign in a * b = a × A-2 (3a-b)?
14. If a * b = 3a-b and X * (2 * 3) = 1, then what is x Please give the procedure, preferably in algebra
15. Z is the second power of 3A. What do * and 2n mean
16. It should be 3A = 4b, so a: B = 3:4______ (judge right or wrong)
17. A math problem needs detailed explanation After receiving the money, the waiter remembered that the hotel was doing activities now, the original price was 10 yuan per person, and now the activity price was only 25 yuan for three people. But considering that the remaining 5 yuan was not easy for three people to share, he left 2 yuan for them, and then gave them 1 yuan each, The total price is 9 * 3 + 2 = 29 yuan, but the three of them pay 30 yuan. Where is the remaining 1 yuan?
18. The page numbers of the first volume and the second volume share a 777 number, and the first volume has seven more pages than the second volume___ Page
19. Given that f (x) = (m-1) x ^ 2 + 2mx + 1 is even function, then f (x) is in the interval (- 5, - 2) A increasing function B decreasing function
20. A mathematical problem, requires detailed explanation A bucket of water is poured out for the first time, one sixth of which is poured out for the second time, one third for the last time, and one fourth for the last time. At this time, the water belt bucket is 20 kg, and the weight of the bucket is 5 kg. How many kg of water are there in the bucket at the beginning? A 50 B 80 C 100 D 36