![](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>)
The original question is that the purchase price is 1000 yuan, and the selling price is 1500 yuan. Because the sales are not good, the price is reduced, but the profit is not less than 5%. How much should the price be reduced?
When the profit margin is 5%, the price should be 1050 yuan
Price reduction less than 1500-1050 = 450 yuan
If a business sells two kinds of shirts at the same price, the profit of a kind of shirt is 30%, and that of B kind of shirt is only 14.4%. If the price of a kind of shirt is increased by 3.9 yuan, the profit will be the same as that of a kind of shirt. How much is the cost of a kind of shirt and B kind of shirt?
Let a cost be x and B cost be y
X*1.3=Y*1.144 (1)
Y*1.144+3.9=Y*1.3 (2)
From (2)
Y=25
Substitute (1) to get
X=22
P is the moving point on the ellipse x ^ 2 / 9 + y ^ 2 / 5 = 1, m and N are the left and right focus respectively. If | PM | * | PN | = 2 / (1-cosmpn), find the coordinates of P
In △ MPN, Mn ^ 2 = PM ^ 2 + PN ^ 2-2pm * PN * cosmpn = (PM + PN) ^ 2-2pm * PN (1 + cosmpn) 4 ^ 2 = 6 ^ 2 - [2 * 2 / (1-cosmpn)] * (1 + cosmpn) cosmpn = 2 / 3 > 0sinmpn = √ 5 / 3P
The square of x-2x-6 is done by factoring in real numbers
And 2x (x + 4) - 7
X^2-2X-6=(X-1-√7)(X-1+√7)
2X（X+4)-7=2X^2+8X-7=2(X+2-√30/2)(X+2+√30/2)
The angle between b1d1 and acd1 in cube abcd-a1b1c1d1
The distance from key step 1B1 to acd1 is 2 / 3 of the distance from b1d
Let the edge length of a cube be a,
Then b1d1 = √ 2A
B1D=√3a
Let b1d1 and acd1 form an angle α
Then sin α = (2b1d / 3) / (b1d1)
=[2√3a/3]/√2a
=√6/3
So the sine of the angle between b1d1 and acd1 is √ 6 / 3
Recurrence formula of sequence 1,3,7,13,21
Let's use A1, A2, A3, A4, a5. To represent these numbers, then there is a sequence formula: (1 ^ for square form)
a1=1^—0
a2=2^—1
a3=3^—2
a4=4^—3
a5=5^—4
.
Given that the line AB = 9, there is a point P on the plane. (1) if PA = 5, then what is Pb equal to, P is on the line AB（
(2) When p is on the line AB and PA = Pb, the position of P is determined and the size of PA + Pb and ab is compared
1) When Pb = ab-pa = 9-5 = 4, P is on the line ab. 2) when p is on the line AB, and PA = Pb, PA = Pb = 4.5, P is on the midpoint of AB, PA + Pb = AB = 9
0.2-0.1x\0.3-0.3X-1\0.2+5=X-1
0.2-0.1/0.3-0.3X-1/0.2+5=X-1,
1/5-1/3-0.3X-5+5=X-1,
1.3X=1+1/5-1/3
=13/15
X=10/15=2/3
How to find the value range of diagonal in parallelogram?
In a triangle composed of two adjacent sides of a parallelogram and a diagonal, the value range of the diagonal can be obtained by using the relationship between the three sides of the triangle: the sum of any two sides is greater than the third side
2/3x=3/4y=2/5z x+y+z=215
Let 2 / 3x = 3 / 4Y = 2 / 5Z = K
Then x = 3 / 2K & nbsp;, y = 4 / 3k, z = 5 / 2K
Substituting x + y + Z = 215
That is 3 / 2K + 4 / 3K + 5 / 2K = 215
So k = 645 / 16
So x = 1935 / 32, y = 215 / 4, z = 3225 / 32
Is it 4 / 3Y, which is more convenient
RELATED INFORMATIONS
- 1. What is the calculation formula of commodity profit rate
- 2. The calculation process of one variable linear equation 15x+11(25-x）=221
- 3. 1. If we know (x = 2 / x) to the power of two = 5, then (x + 2 / x) to the power of two= 2. Calculation problem The second power of (x-1) - 4 / (x + 1) / the second power of X-9 / x + X 3、2a2-18／a(a+3)-2(a+3)÷(a-3)·a(a-3)+2(3-a)／a2-6a+9 4. Usually, when buying the same watermelon with the same quality in other aspects, people hope that the larger the proportion of watermelon ladles in the whole watermelon, the better. We regard watermelon as a sphere, and the density of watermelon ladles as uniform. The thickness of watermelon rind is a. the known volume formula of the sphere is v = 4 / 3 π R3 (where R is the radius of the sphere) (1) What is the volume ratio of watermelon ladle to the whole watermelon? (2) Let the radius of big watermelon be r, and the radius of small watermelon be r (r > R). Do you think it's cost-effective to buy big watermelon or small watermelon? Explain your reason through calculation 1. For filling in the blanks, 2,3 for calculation, 4 for application
- 4. 1. If we know (x = 2 / x) to the power of two = 5, then (x + 2 / x) to the power of two= 2. Calculation problem The second power of (x-1) - 4 / (x + 1) / the second power of X-9 / x + X 3、2a2-18／a(a+3)-2(a+3)÷(a-3)·a(a-3)+2(3-a)／a2-6a+9 4. Usually, when buying the same watermelon with the same quality in other aspects, people hope that the larger the proportion of watermelon ladles in the whole watermelon, the better. We regard watermelon as a sphere, and the density of watermelon ladles as uniform. The thickness of watermelon rind is a. the known volume formula of the sphere is v = 4 / 3 π R3 (where R is the radius of the sphere) (1) What is the volume ratio of watermelon ladle to the whole watermelon? (2) Let the radius of big watermelon be r, and the radius of small watermelon be r (r > R). Do you think it's cost-effective to buy big watermelon or small watermelon? Explain your reason through calculation 1. For filling in the blanks, 2,3 for calculation, 4 for application
- 5. Fractional addition and subtraction (2+3x)/(4-9x^2)-(1+3x)/(2-3x)-2/(3x-2)
- 6. If the abscissa of the three vertices of △ ABC in the rectangular coordinate system remains unchanged and the ordinate decreases by two unit lengths, it means that △ ABC is moved to the right direction_______ Translation_______ A unit length
- 7. Given that x minus y equals 2, then the square of two parts of x plus the square of Y minus XY
- 8. [three questions to fill in the blanks in the first year of junior high school] ① According to the requirements in brackets, the approximate number of 308.607 (accurate to one digit) is () ② If the complement of an angle is three times its remainder, then the angle is () ③ It is known that the speed of the ship in still water is a km / h, and the water speed is B km / h. The ship has sailed () km in total
- 9. A problem of filling in the blanks in the first grade of junior high school The middle line on the waist of an isosceles triangle divides the triangle into two parts: 12cm and 21cm. Then the length of the bottom of the isosceles triangle is___________ . No picture!
- 10. A problem of filling in the blanks in the first year of junior high school The lengths of the two sides are 5 and 8 respectively Then the value range of the third side is () I hope I can do it right, because the answer was wrong when I asked last time ~! Please tell me the process. I remember a theorem that the third side is greater than or less than Please say it! And fill it in!
- 11. [profit, profit margin, cost, purchase price, selling price, etc.]
- 12. What is the formula for calculating the return on assets?
- 13. -1+-3+-5+-7+-9+、、、、+-97+-99=? By the way, 2 + - 4 + 6 + - 8 +,, + 46 + - 48 + 50
- 14. Common formulas Lots, lots of drops!.. (screams) The formula of the equation, to the original drop
- 15. A stock calculation problem I bought 1000 shares of a stock at 20.5 yuan. When the share price was 17.1 yuan, I bought 1000 shares again. Then I sold 1000 shares at 17.3 yuan?
- 16. What's the profit margin of 80 yuan goods sold at 100 yuan____ %
- 17. The price of a commodity is reduced by 8%, and it is sold at the original price. The profit margin is 10% higher than before? If the purchase price of a commodity is reduced by 8%, it will be sold at the original price, and the profit margin will be increased by 10%? Please explain the specific meaning, such as 1 + X
- 18. Three practical problems of quadratic equation of one variable in the third grade of junior high school! (30 points can be added) 1. Mr. Li deposits 10000 yuan in the bank. First, he deposits one fixed term for one year. After one year, he automatically transfers the principal and interest to another fixed term for one year. After two years, he gets 10400 yuan of principal and interest. What's the annual interest rate of the deposit? (without considering the interest tax) 2. 200 fruit trees will be planted in an orchard this year. Now it is planned to expand the planting area, so that the planting amount in the next two years will increase by the same percentage as that in the previous year. In this way, the planting amount in three years (including this year) will be 1400, so this percentage can be calculated 3. A container is filled with 20 liters of pure liquid medicine. After several liters are poured out for the first time, it is filled with water. When the same volume of solution is poured out for the second time, only 5 liters of pure liquid medicine are left in the container. How many liters of liquid are poured out each time? Just write the set and the equation, not the solution
- 19. Simple calculation problem （1）(1+3+5+… +1999+2000+2001）-（2+4+6+… +1998+2002） （2）99… 9 [2000 9] * 99 9 [2000 9] + 199 9 [2000 9s]
- 20. A practical problem To build a road, one sixth of the whole road has been built for the first time, and 15% of the whole road has been built for the second time. This is 6 kilometers away from the midpoint of the road. How long is the road?