Merge congeners 2 (a-b) & # 178; - 7 (a-b) & # 179; + 3 (B-A) & # 178; - (B-A) & # 179;
2(a-b)²-7(a-b)³+3(b-a)²-(b-a)³=2(a-b)²-7(a-b)³+3(a-b)²+(a-b)³=2(a-b)²+3(a-b)²-7(a-b)³+(a-b)³=5(a-b)²-6(a-b)...
Merge congeners 2 (a + b) & # 178; - 7 (a-b) & # 179; + 3 (B-A) & # 178; - (B-A) & # 179;
2(a+b)²-7(a-b)³+3(b-a)²-(b-a)³
=2(a+b)²-7(a-b)³+3(b-a)²+(a-b)³
=2(a+b)²-6(a-b)³+3(b-a)²
RELATED INFORMATIONS
- 1. 1. Merge congeners A & # 179; - A & # 178; b-ab & # 178; + A & # 178; B + A & # 178; B + B & # 179; 2. First simplify, and then evaluate 1-4x & # 179; - 5x & # 178; + 2X-4, where x = 2
- 2. The ratio of cement, sand and stone is 2:3:5. The existing raw materials are 20 tons each. When all the sand is used up, how many tons more cement and stones need to be added?
- 3. Three parts of concrete, sand, two parts of stone, cement together, how much sand accounts for concrete, how much less stone than sand? If 2 tons of cement is needed, how many tons of concrete
- 4. One kind of concrete is made of cement, sand and stone according to the standard of 2:3:5. Now there are 18 tons of cement, how many tons of sand and stone are needed?
- 5. A kind of concrete is made of cement, sand and stone in addition to water. The ratio of cement, sand and stone is 2:3:5 Sand 1800kg, stones 3520kg, the construction director asked the workers on the basis of not adding these three materials, as much as possible to mix this kind of concrete, so how many kg of this kind of concrete can be mixed with these materials at most?
- 6. Five tons of cement, yellow sand and stones are mixed into concrete with the ratio of cement, yellow sand and stones of 5:3:6. If the cement is just used up, will yellow sand and stones be enough? If not, how many tons less? If so, how many tons more?
- 7. A construction site uses 50m3 sand and gravel, and it is transported by trucks with a loading capacity of 3.5t. How many trucks should be transported at least? (the known density of sand is 2.6 × 103kg / m3)
- 8. A tanker is loaded with 30 cubic meters of oil, and a tanker is loaded with 30 cubic meters of oil. Xiao Ming wants to measure the density of oil and take 30 milliliters of oil from the tanker The mass is 24.6 G (1) What is the density of oil? (2) What is the quality of the oil in this tanker?
- 9. A tanker with a volume of 50 cubic meters is filled with oil. 30ml of oil is sampled from the oil tank and its mass is 24.6 g. then the tanker can hold () t of oil
- 10. What is compaction coefficient
- 11. The distance between the moon and the earth is about 390000 km. The information of the moon obtained by the satellite is transmitted back to the earth in the form of radio waves. The propagation speed of radio waves is 3 × 10 ∧ 5. How many seconds does it take for the satellite to transmit the information to the earth
- 12. It takes 2.56s for the radio wave to return to the earth after it reaches the moon. It is known that the radio wave travels 3 * 10 quintic km per second, and the distance between the earth and the moon is calculated. (the result is accurate to 10000 bits)
- 13. The distance between the moon and the earth is about 3.8 × 15 km. So the distance of the moon around the earth in half a lunar month is________ The magnitude of displacement is_____ km. How to do ah... Understand please make a complete analysis I will be very grateful to you
- 14. There are two point charges in vacuum, Q1 = + 4.0 times 10 to the power of - 8C and Q2 = - 1.0 times 10 to the power of - 8C, which are fixed at x = 0 and x = 6cm respectively Why is the electric intensity always along the positive direction of x-axis between 0-6cm?
- 15. In vacuum, there are two point charges which are 0.3m apart and have the same charge quantity. The electrostatic quantity between them is 1 × 10 to the negative third power In vacuum, there are two point charges which are 0.3m apart and have the same charge quantity. The electrostatic quantity between them is 1 × 10 to the negative third power. How many element charges does each point charge carry?
- 16. The distance between two static point charges in vacuum is 10 cm. The electrostatic attraction between them is 9 times 10 to the negative fourth power. When they join together, they will become a point charge with a charge of 3 times 10 to the negative eighth power Coulomb. How much is the charge of the two points?
- 17. There is a point charge with charge q = - 3 × 10-6c. When it moves from point a to point B in the electric field, it does 6 × 10-4j work against the electric field force. When it moves from point B to point C, it does 9 × 10-4j work. Question: (1) what are the potential differences among AB, BC and Ca? (2) If the potential at point B is zero, what are the potentials at points a and C? What is the potential energy of charge at a and C?
- 18. In vacuum, there are two identical metal spheres (both can be regarded as point charges) with charge quantity - Q1 and + Q2 (Q1 > Q2). When the distance between them is r, the Coulomb force between them is F. now put the two spheres back in contact, and the Coulomb force between them becomes f / 3, what is Q1: Q2
- 19. When the distance between two identical metal spheres is r, the interaction force is f Now, if the spheres are separated after contact so that the distance between them is R / 2 and the interaction is 4f / 3, then Q1: Q2 is?
- 20. There are two point charges a and B in vacuum, and their charge quantity QA = 2qb. When the distance between them is 0.01cm, the interaction force is 1.8x10 to the - 5th power