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The film crew had a day's journey from city a to city B. they planned to walk 100 kilometers more in the morning than in the afternoon to have lunch in city C. due to the traffic jam, they arrived at a small town at noon and drove only one third of the original plan. After passing the town, the car drove 400 kilometers and stopped in the evening to have a rest. The driver said that one third of the journey from City C to here would reach the destination How many kilometers away?
Suppose that the distance between the two cities is x km, then we can know from the question: CA = 12x + 50km, BC = 12x-50km, be = 13bc = 16x-503km, CE = 23bc = 13x-1003km, ad = 13ac = 13 (12x + 50) = 16x + 503, de = ab-ad-be = x - (16x + 503) - (16x-503) = 23x, ∫ de = 400, ∫ 400 = 23x ∫ x = 600 (km)
If a commodity is sold at 10% discount, the profit margin is 15%. If it is sold at 20% discount, the profit is still 40 yuan
Suppose the price of the commodity is X Yuan and the purchase price is y yuan. From the meaning of the title, we get 0.9x − y = 15% y0.8x − y = 40, and the solution is x = 2300y = 1800. Answer: the price of the commodity is 2300 yuan
In a middle school student's social practice activity with the theme of "learning to survive", Chunhua, in order to exercise himself, bought a number of T-shirts with the 2008 Beijing Olympic logo from the wholesale market at the price of 6 yuan per piece, and sold them in the free market. After 30 pieces were sold, the sales amount reached 300 yuan, and the rest were reduced by 2 yuan per piece At this time, the sales amount reached 380 yuan, and Chunhua got net income in this activity______ Yuan
The starting price is 300 △ 30 = 10 yuan, and the price after the price reduction is 10-2 = 8 yuan. After the price reduction, (380-300) △ 8 = 10 pieces are sold. Chunhua's net income in this activity is 380 - (30 + 10) × 6 = 140 yuan
Who has all the formulas for solving the equation of first degree with one variable
First of all, the unknowns must be clear, and it will not be difficult in the future. According to the conditions, and their own set of unknowns out of the equation, some problems need to use the unknowns several times, that is an empirical problem. Come on! I believe you can learn it well! These methods just play a transitional role, really learn the equation does not need
If a point a is known, then the tangent slope of point a is equal to?
Let the equation of the curve be y = f (x)
Then the tangent slope of the curve at point x = x0 can be expressed as: k = f '(x0)
The tangent equation at point (x0, Y0) is
y-y0=f'(x0)(x-x0)
y=y0+f'(x0)(x-x0)
y=f(x0)+f'(x0)(x-x0)
It is known that AB is a positive number different from each other, a is the median of A.B. G is the median of A.B. is there any definite median of a and B?
It is known that AB is a positive number different from each other, and G is the median of A.B
So, G ^ 2 = a * B
G = positive and negative √ (AB)
So it's not sure whether it's positive or negative,
This topic has nothing to do with a
The main content of special relativity is briefly introduced
Special relativity is mainly the theory of invariable speed of light. No matter what it is, the speed of light is always invariable and always propagates from one point to another at a constant speed. Two people who are moving with each other calculate the time difference between light passing through a common point and another point through the principle of invariable speed of light, and they will find that each other's "scale clock slow" effect is wide
It is known that (2x-21) (3x-7) - (3x-7) (X-13) can be decomposed into (3x + a) (x + b), where a and B are integers, then a + 3B=
Decomposition factor: X & # 178; - Y & # 178; - 3x-3y=
(2x-21) (3x-7) - (3x-7) (X-13), = (3x-7) (2x-21-x + 13), = (3x-7) (X-8), then a = - 7, B = - 8, a + 3B = - 7-24 = - 31, so the answer is: - 31. X & # 178; - 3x-3y = (x + y) (X-Y) - 3 (x + y) = (x + y) (x-y-3)
The perimeter of a square is 25m, and its side length is 25m______ m. What is the area______ Square meters
25 △ 4 = 0.1 (m), 0.1 × 0.1 = 0.01 (M2). Answer: the side length of this square is 0.1M, and the area is 0.01 m2. So the answer is: 0.1, 0.01
Physical average velocity formula
△x/t
RELATED INFORMATIONS
- 1. The first volume of the first year of junior high school is a problem of solving practical problems with linear equation of one variable In the 22 rounds of the Super League, a team scores 27 points. The ratio of the number of draws and losses is 2:3. Find the number of wins of the team
- 2. Linear equation of one variable There are 48 barrels of water in the two tanks. Tank a adds twice as much water to tank B, and then tank B adds the remaining half of tank a to tank A. then the water in the two tanks is equal. How many barrels are there in the first two tanks?
- 3. Engineering problems of linear equation with one variable To process a batch of parts, workers a need 15 hours, workers B need 20 hours, and workers C need 10 hours. Now, workers a and B process 5 hours at the same time, and then workers C do it alone. How many more hours to complete!
- 4. Solving engineering problems with linear equation of one variable To build a road, it takes 3 days for team a to do it alone, and 7 days for team B to do it alone. If team a and team B construct from both ends at the same time, how many days will it take to dig a good canal?
- 5. How to make linear equation with one variable? Use an example to analyze,
- 6. Who can give me a few one variable equation problems It is difficult and not practical
- 7. A series of linear equations with one variable An individual taxi driver is required to pay 1400 yuan per month and 0.5 yuan per kilometer for gasoline; another state-owned taxi company is required to pay 1.2 yuan per kilometer for gasoline without salary (1) If the unit runs an average of a kilometer per month, how much will each of the two car rental schemes cost? (2) Please design a plan for the unit, so that the unit can choose a reasonable way to rent a car
- 8. The afforestation activity of "protecting mother river" has been carried out in a city. Jinqiao village has 1 & nbsp; 000 mu of wasteland, the greening rate is 80%, 300 mu of good land is regarded as greening, and the greening rate of river slope has reached 20%. At present, the greening rate of all the land in Jinqiao village is 60%. How many mu of river slope is there
- 9. On practical problems and engineering problems of linear equation with one variable! 1. A pool has two taps, a and B. a single tap can fill the empty pool in 2 hours, and a single tap can fill the empty pool in 3 hours. Now turn on the tap first, and then turn on both taps half an hour later. How many hours does it take to fill 2 / 3 of the total volume of the pool 2. There are three water pipes a, B and C in a pool. A and B are the inlet pipe and C is the drainage pipe. The pool can be filled in 16 minutes by opening pipe a, 10 minutes by opening pipe B, and 20 minutes by opening pipe C. now open pipe a and B first, and close pipe a after 4 minutes C pipe, ask again after a few minutes to fill the pool I hope it's faster and more accurate I'll wait online
- 10. If the price of type I refrigerator is 2298 yuan per unit and that of type II refrigerator is 1999 yuan per unit, according to the relevant policy of "home appliances to the countryside", the government subsidizes the farmers who buy refrigerators at 13% of the price of each refrigerator. Q: how many yuan has the government subsidized the 1228 type I refrigerators and type II refrigerators sold to the farmers in the first month after the launch of the activity (2 valid figures are reserved)?
- 11. The first order equation of one variable, The two ports of AB are 300 km apart. If ship a goes downstream from a to B, and ship B goes from B to a at the same time, the two ships meet at C. If ship B goes downstream from a to B, and ship a goes from B to a at the same time, the two ships meet at D. It is known that the distance between two places of CD is 30 km, and the speed of ship a is 27 km / h,
- 12. A problem of linear equation with one variable in grade one mathematics of junior high school The electricity charge of a factory in the first quarter was a yuan, and the water charge was 40 yuan more than twice the electricity charge. In the second quarter, the electricity charge was saved by 15%, and the water charge was 38% more. Q: compared with the first quarter, the water charge of the factory in the second quarter was overspent or saved? How many yuan was overspent or saved? List the equations
- 13. A and B are moving in the same direction on the road at a constant speed. A's speed is 3 km / h, and B's speed is 5 km / h. A passes through place a at 12 noon, and B passes through place a at 2 pm. What time can b catch up with a in the afternoon? How far is it from ground a?
- 14. Line segment proof: known: point C is a point on line segment AB, and 3aC = 2Ab, D is the midpoint of AB, e is the midpoint of CB, de = 6, find the length of ab Why is be = 1 / 3bC = 1 / 6ab in this question?
- 15. Given that the direction vector of the line L1: x + A ^ 2Y + 1 = 0 is parallel to the normal vector of the line L2: (a ^ 2 + 1) x-by + 3 = 0, and AXB is not equal to 0, find the minimum value of | ab | I get a ^ 2B = a ^ 2 + 1 Then what should we do?
- 16. How much cloth does it take to make a suit One meter means one square meter or something else? Please do me a favor to make a suit,
- 17. In the right triangle ABC, the angle ABC is 90 degrees, the circle O with diameter AB intersects AC at e, and D is the midpoint on the side of BC, connecting de. it is proved that De is the tangent of circle o
- 18. Given that the side length of each small square in the path graph is one centimeter, find out the area of "comma"
- 19. Factorization x3-3x2 + X + 1 = 0
- 20. Let a straight line passing through the focus of the parabola y2 = 2px (P > 0) intersect with the parabola. Let the coordinates of the two intersections be a (x1, Y1) and B (X2, Y2) respectively. Prove: (1) y1y2 = - P2 (2) x1x2 = p24