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A shopping mall can make a profit of 2 yuan for each stationery. In order to support the poor mountainous areas, it is now sold to a mountainous school at a 70% discount of the original price. As a result, the profit of each stationery is 0.2 yuan (profit = selling price purchase price). How much is the purchase price of each stationery?
Suppose that the purchase price of the stationery is x yuan, according to the meaning of the question: 70% · (x + 2) - x = 0.2 solution: x = 4 answer: the purchase price of the stationery is 4 yuan
A shopping mall can make a profit of 2 yuan for each stationery. In order to support the poor mountainous areas, it is now sold to a mountainous school at a 70% discount of the original price. As a result, the profit of each stationery is 0.2 yuan (profit = selling price purchase price). How much is the purchase price of each stationery?
Suppose that the purchase price of the stationery is x yuan, according to the meaning of the question: 70% · (x + 2) - x = 0.2 solution: x = 4 answer: the purchase price of the stationery is 4 yuan
A shopping mall can make a profit of 2 yuan for each stationery. In order to support the poor mountainous areas, it is now sold to a mountainous school at a 70% discount of the original price. As a result, the profit of each stationery is 0.2 yuan (profit = selling price purchase price). How much is the purchase price of each stationery?
Suppose that the purchase price of the stationery is x yuan, according to the meaning of the question: 70% · (x + 2) - x = 0.2 solution: x = 4 answer: the purchase price of the stationery is 4 yuan
Practical problems of volume
1. The fish tank is 80cm long, 50cm wide and 18cm deep?
2. Cube refrigerator, the internal measurement people often have 60cm water in 150cm, add a stone, the water surface rises to 130cm, how much is the fast stone?
The fish tank is 80cm in length, 50cm in width and 18cm in water depth. What is the height of filling the tank with 2L water?
5cm 1575cm3
1. Water level rise 2000 (ML) / (80 * 50) = 0.5cm
Water depth = 18 + 0.5 = 18.5cm
2. Is it 150cm long?
The water level rose 130-60 = 70cm
Stone volume = 150 * 150 * 70 = 157500 cubic centimeter = 1575 cubic decimeter
Conversion rate of the speed of physical movement in grade two of junior high school
That is, how many times should km / h become m's
You can change km into m h into s, that is to say, if km, you multiply 1000 h and you multiply 3600 H
What is the number of 100 000 decimal places of Pi?
Calculate [2x ^ 2 - (x + y) (X-Y)] [(- X-Y) (Y-X) + 2Y ^ 2]
[2x^2-(x+y)(x-y)][(-x-y)(y-x)+2y^2]
=（2x²-x²+y²）(x²-y²+2y²)
=(x²+y²)(x²+y²)
=x^4+2x²y²+y^4
If you want to add other questions, please click "I want to ask for help" after adopting this question,
Factorization X4 + X3 + 2x2-x + 3
x4+x3+2x2-x+3=x^4+2x^3+3x^2-x^3-2x^2-3x+x^2+2x+3=x^2(x^2+2x+3)-x(x^2+2x+3)+(x^2+2x+3)=
(x^2+2x+3)(x^2-x+1)
1.5 can () a, divide by 3. B, divide by 3. C, divide by 3
B
F1, F2 are the two focal points of the ellipse x * / 100 + y * / 64 = 1, P is a point on the ellipse, then the maximum value of | Pf1 |. | PF2 | is | Pf1|
|PF1|+|PF2|=20,
The maximum value of | Pf1 | * | PF2 | = (20 / 2) ^ 2 = 100
RELATED INFORMATIONS
- 1. Each pencil is 0.9 yuan, 2 yuan, 3 yuan, 4 yuan, 5 yuan. Which pencil is cheaper? The number of people who want to score is limited, only one, and those who want to score will come quickly
- 2. Xiao Ming bought several pencils at the price of 1 yuan and 3 pencils, and sold them all at the price of 2 yuan and 5 pencils. If he made 10 yuan, do you know how many pencils he sold?
- 3. Xiao Ming bought three kinds of stationery: pencil, eraser and exercise book. It is known that their numbers are different prime numbers and satisfy the equation: number of pencils * (number of pencils + eraser)
- 4. Li Ming went to the stationery store to buy pencils and erasers for 30 students in the school's art group. It is known that each pencil costs m yuan, and each eraser costs n yuan For two pencils and three erasers, the total payment is RMB
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- 6. According to the price of the stationery box is two fifths less than that of the schoolbag, fill in the quantity relation
- 7. Xiaoju spent 50 yuan to buy a schoolbag and a pencil case. The price of the pencil case is one ninth that of the schoolbag. How much did she spend to buy a schoolbag
- 8. The price of a schoolbag is 36 yuan more than that of a pencil case, which is three times as much as that of a pencil case. How much is a schoolbag and a pencil case
- 9. The price of two different schoolbags sold by the store is 60 yuan. According to the cost, one of them lost 1 / 4 and the other earned 1 / 4. Did they earn or lose money when they were sold? Why
- 10. Xiaoming, Xiaolan and Xiaogang each have some balls. For example, after Xiaoming gives Xiaolan 10 balls and Xiaolan gives Xiaogang 6 balls, the three have the same number of balls. Ask Xiaolan more than Xiaogang less
- 11. The number of pencils in the stationery shop is twice that of pens. Every day, 15 pens and 20 pencils are sold out. After a few days, there are still 80 pencils left. How many pens and pencils are there in the stationery shop?
- 12. At the stationery counter of a store, if 16 pencils are sold, the ratio of the number of pencils left to the number of pens is 1:3. If 52 pens are sold again, C At the stationery counter of a store, if 16 pencils are sold, the ratio of the number of pencils left to the number of pens is 1:3. If 52 pencils are sold, the ratio of the number of pencils left to the number of pencils is 2:5. How many pencils are there?
- 13. The stationery store bought 18 boxes of stationery today, including 540 pens and 840 erasers. If the number of erasers in each box is the same as that of pens, how many erasers are there?
- 14. The school plans to buy 40 pens and some notebooks (the number of notebooks exceeds the number of pens). The price of both a and B plus the stationery shop is 10 yuan for each pen and the number of notebooks It's 2 yuan per book. The preferential way of shop a is 10% off for pens and 20% off for notebooks. Shop B's preferential way is to give one notebook for every five pens. Pens are not discounted, and notebooks are 7.5% off. So how to buy more cost-effective (please see the title and come back) good bonus points
- 15. Buy 3 pens in a stationery shop and get 2 free pens, 4 yuan each. How much should I pay for 12 pens?
- 16. The stationery store bought 100 pens at the price of 4 yuan each, and each pen was sold at 6 yuan. When some pens were sold, the remaining pens were sold at a 10% discount. When all pens were sold, the store made a total profit of 188 yuan. How many pens were sold at a 10% discount? Don't use the equation, but use the formula
- 17. I bought a pen, notebook, stationery and schoolbag in the mall
- 18. In order to promote a commodity with the same price, supermarket a, supermarket B and supermarket C cut prices by 20% twice in a row, 40% at a time in supermarket B, 30% at the first time in supermarket C and 10% at the second time. Which supermarket is more cost-effective for customers to buy this commodity A. B. B. C. C. D
- 19. In order to promote a product priced at M yuan, supermarket a, supermarket B and supermarket C cut prices by 20% twice in a row, 40% at a time in supermarket B, 30% at the first time in supermarket C and 10% at the second time. At this time, the most cost-effective supermarket for customers to buy this product is () A. A B. B C. C D. B or C
- 20. Every day, the supermarket bought back a batch of T-shirts from other places with 50000 yuan. Due to the good sales, the mall urgently allocated 186000 yuan to buy back T-shirts that were twice as much as the first time. However, the second time was 12 yuan more expensive than the first time. The mall sold them at the price of 80 yuan. In order to shorten the inventory time, the last 400 T-shirts were sold out at a discount of 6.5% How much is the profit of the Communist Party of China?