![](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>)
A and B travel from 1200km to each other at the same time. A walks 55km per minute, B 55m per minute and B 45m per minute. The shortest distance between the two vehicles is 200km in a few hours. If they continue to drive in the same direction, in a few hours, the distance between the two vehicles will be 200km?
(1200-200) divided by (55 + 45) = 10 200 divided by (55 + 45) = 2 10 + 2 = 12
The graph of the function y = x ^ 2-6x + 5, X ∈ [- 1,5] is given, and the monotone interval and the maximum value of the function are obtained
Let's change it into the vertex formula... Y = (x-3) ^ 2 - 4.. we get that the axis of symmetry is x = 3 and the opening is upward
And then because x ∈ [- 1,5]
So [- 1, 3] decreases and... (3, 5) increases
So the maximum value of Y has a minimum value of - 4
I want to ask my parents to help me solve a math problem
The line passing through the parabola y2 = 4x, (2 represents the square) focal point intersects the parabola at two points a and B. It is known that | ab | = 8, O is the coordinate origin, what is the abscissa of the center of gravity of the triangle OAB? What is the inclination angle of the line AB?
The abscissa of the center of gravity of the triangle OAB is 2
The inclination angle of line AB is 45 degrees or 135 degrees
RELATED INFORMATIONS
- 1. 1. A freighter travels an average of 48 kilometers per hour. It takes 5 hours to get from port a to port B. when it returns, it goes against the current, and its speed is one sixth slower than that in the current. How long does it take for this freighter to go back and forth? 2. It will take 10 days for the two engineering teams to complete a project together. Now team a will do it for three days, and then team B will do it for four days. Three eighths of the project will be completed. How many days will it take for the two teams to complete the project independently?
- 2. Find the range of the following functions. 1. Y = x2-5x = 6 (x is greater than or equal to - 3, less than or equal to 2) 2. The absolute value of the difference of y = (x2-2x) + 1
- 3. Math questions, correct answers, score recovery 1. If m square + M-1 = 0, find m cube + 2m square + 20142. Prove that the value of polynomial (A-2) (a square + 2A + 4) - [3A (a + 1) square - 2A (A-1) square - (3a + 1) (3a-1)] + a (1 + a) has nothing to do with the value of A
- 4. Three math problems. Urgent 1. The 4-meter-long rope is cut into 9 sections on average. How many meters are the two sections taken out? 2. A △ B = 18, then what is the least common multiple of a and B? 3. There is a cuboid ice storage container which is 80cm long, 60cm wide and 115cm high. It is filled with cubes of the same size. How many cubes of ice can this container hold at least?
- 5. 1. The income ratio of Zhang Jia and Li Jia this month is 8:5, and the expenditure ratio this month is 8:3. At the end of the month, Zhang Jia saved 240 yuan and Li Jia saved 510 yuan? 2. The ratio of tons of grain stored in warehouse A and warehouse B was 8:7, and the ratio of tons of grain transported out this month was 4:1. At the end of the month, there were 400 tons of grain in both warehouses. How many tons of grain was stored in warehouse a?
- 6. The ratio of the number of girls in Grade 6 to that in Grade 6 is 60 to 236 I'm sorry. I'm sorry. It's 60 to 125
- 7. For a square brick, the ratio of length to width is 2:1, and the ratio of height to width is 2:1. The total length of all edges of this brick is 140 cm. What is the length, width and height
- 8. [black rabbit] y white rabbit] 8 more than black rabbit] refers to y rabbit] refers to 8 more than black rabbit
- 9. 2 × 1 / 3 = 1 / 2 - 1 / 3, 3 × 1 / 4 = 1 / 3 - 1 / 4, 2 × 1 / 4 = 1 / 2 × (1 / 2 - 1 / 4) 1、 What do you find in it? 2、 Use your findings to work out the following two questions （1）1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 （2）1/1×4+1/4×7+1/7×10+1/10×13+1/13×16
- 10. The most difficult math problem in the world o o o o o o o o o o o o o o o o o o o o o o o o Connect each circle with a straight line, not a diagonal line, not a blank line, not a cross line
- 11. Help to do the following math problems 1. In the following equations, the quadratic equation with respect to X is () A. The square of 3 (x + 1) = 2 (x + 1) B. Square of 1 / x + 1 / X-2 = 0 C. The square of AX + BX + C = 0 D. Square of X + 2x = square of X-1 2. The root of equation 2x (x-3) = 5 (x-3) is () A.x=1/2 B.X=3 C.X1=5/2,X2=3 D.X=5/2 3. For any real number x, the square of polynomial x-2x + 3 is a () A. Positive number B. Negative number C. Nonnegative number D. Not sure 4. If there are two unequal real roots of the square - 6x + 9 = 0 of the quadratic equation KX with respect to x, then the value range of K is () A.K＜1 B.K≠0 C. K ＜ 1 and K ≠ 0 D.k＞1
- 12. First, put six identical cubes into a cuboid (horizontally, three in front and three in back, because there is no picture, so it is). The surface area of this cuboid is 220 square centimeters. How many square centimeters is the surface area of each cube? Second: the edge length of a cube glass fish tank is 6 decimeters. How many square decimeters does it need to make the fish tank? How much space does the fish tank occupy? (there is no cover on the fish tank) Third: Shanghai Oriental Pearl TV Tower is 468 meters high, 31 times higher than the average residential building 3 meters. How many meters is this ordinary residential building? Fourth: Mr. Li can type 80 words per minute. Mr. Zhang's typing speed is 3 / 4 of that of Mr. Li and 5 / 6 of that of Mr. Huang. How many words can Mr. Huang type per minute?
- 13. Football is made of black and white leather, black leather is 5-Sided, white leather is 6-sided. A football Black Leather 12, then white leather? It has a picture A piece of white skin has only three sides connected with black skin. The other three are white.
- 14. Yes, please give me the answer It is known that in one square kilometer of land, the energy obtained by the sun in one year is equivalent to the energy generated by burning 1.3 × 10 5-th-power tons of coal. So, in China's territory of 9.6 × 10 6-th-power square kilometer, the energy obtained from the sun in one year is equivalent to the heat generated by burning about how many tons of coal?
- 15. A department organizes Party A and Party B to decipher a password, and whether each of them can decipher the password is independent of each other. It is known that the probabilities of Party A and Party B deciphering the password independently are 13 and 14 respectively. (1) find out the probability of one of them deciphering the password; (2) find out the probability of them deciphering the password; (3) now transfer Party B away, and Party A stays, and the probability of deciphering the password is not low At 80%, how many people should be added at least?
- 16. There are two containers. One container contains twice as much water as the other container. If 8 liters of water are poured from each container, the water in one container is three times as much as the water in the other container______ It's a liter
- 17. The image of quadratic function y = AX2 + BX + C (a > 0) has only one intersection point with X. A and Y axis intersect at point B, and OA = ob (1) The value of B (2) If the image of quadratic function y = AX2 + BX + C is translated 1 / a unit down and then h units to the left, let the parabola and X axis intersect at points c and D, which indicates the quantitative relationship between line CD and ob (3) Translate the image of quadratic function y = AX2 + BX + C down 1 / a unit, let the vertex of the parabola be e, and the parabola intersects the y-axis at point F. ask whether there is a point P on the parabola on the right side of the y-axis, so that the triangle PEF is isosceles triangle? If there is, find out the point P coordinate. If not, explain the reason
- 18. It is known that in ladder ABCD, AD / / BC, point E is on AB, point F is on AC, and ad = a, BC = B Ask for: (1) Let E and f be the midpoint of AB and DC respectively, and verify: EF / / BC, and EF = half (a + b) (2) If: AE than EB = DF than FC = m than N, judge whether EF and BC are parallel, and use the algebraic expression of a, B, m, n to express EF, and prove. This problem can still be imagined without a picture, that is, an ordinary trapezoid has made a median line. The essence is to prove that the trapezoid median line is one-half of the trapezoid (upper bottom + lower bottom) and parallel to the bottom`
- 19. 1. Party A and Party B are running on a 400m long probation track. The speed of Party A is 360m / min, and that of Party B is 240m / min. how many laps did they run together when they first met? How many seconds later did they meet for the first time 2. A and B go out for a walk at the same time from a and B, which are 50 meters apart. A runs 3 meters per second and B runs 2 meters per second. A takes a dog to start with him at the same time. If the dog runs to B at the speed of 10 meters per second, he runs back to a when he meets B, and then he runs back to B when he meets A. when a and B meet, the dog stops and asks how many meters the dog has run? 3. The distance between the two places is 0.4km. A and B start from place C at the same time and walk in opposite directions. A walks to a at the speed of 4km per hour, B walks to B at the speed of 5km per hour, and when a arrives at place a, they catch up with B by bike at the speed of 12km per hour. How long does it take from place C to catch up with B?
- 20. Several difficult mathematical problems 1. With a circumference of 60 meters, objects a and B move in the same direction from the same point along the far periphery at the same time (a is faster than B) and meet every 15 seconds. If they move in the opposite direction at the same point at the same time, they meet every 5 seconds to calculate the movement speed of objects a and B 2. repair a road, the individual manicure team needs 20 days to complete, the second team completes 12 days. The first team has been trained for a few days to transfer, and the second team continues to repair. It has been shared for 14 days from the beginning to the end of the repair. How many days have the team been repaired? 3. For a batch of parts, Master Zhang has to work for 20 hours, but master Wang has to work for 30 hours. If two people work at the same time, Master Zhang has 60 more parts than Master Wang. How many parts are there in total?