For 2,7, - 6,19, - 22,39 The tenth item is [], and the nth item is [] I've become stupid recently. I can't find out who can help me=-=
The tenth is - 78 123
RELATED INFORMATIONS
- 1. If 3 ^ n + 11 ^ m can be divided by ten, can 3 ^ n + 4 also be divided by ten? most urgent!
- 2. 10. 10. 4. 4, four numbers, how to calculate equal to 24
- 3. (1) Ay ^ 2-2a ^ 2Y + A ^ 3 (2) (a-b) ^ 2-4a ^ 2B ^ 2 process decomposition factor
- 4. In the book corner of class 5 (1), there are 246 more comic books than story books. The number of comic books is four times that of story books. How many comic books and story books are there?
- 5. It is known that the circumference of an isosceles triangle is 30cm, and the length of one side is twice the length of the other side Length of each side
- 6. The passenger car and the freight car leave from a and B at the same time. The passenger car travels 60 kilometers per hour. It takes 10 hours for the freight car to complete the whole journey Passenger cars and freight cars leave from a and B at the same time. Passenger cars travel 60 kilometers per hour. It takes 10 hours for freight cars to complete the whole journey. When freight cars travel to 13 / 24 of the whole journey, passenger cars already travel 5 / 8 of the whole journey. How many kilometers is the distance between a and B?
- 7. The four numbers can be divided by 2357, and the quotient is the same. The sum of the four numbers is 408. What are their respective numbers,
- 8. There are 7 people in a tour group. They are going to the railway station by two cars (5 people in each car including the driver). One of them breaks down at a distance of 10km from the railway station. At this time, there are 40 minutes to check in. At this time, the only available car is another car. Assuming that the average speed of the car is 40km / h and the speed of the passenger walking is 4km / h, there are three schemes (1) The car first takes four people to the railway station, the other three people wait in place, and then take the car back to the railway station (2) While the car takes four people to the railway station, the other three people walk first and then take the car back to the station (3) The car first takes four people to an underground car and returns. These four people walk to the station, while the other three people walk first and then take the car back to the station, and two groups of people arrive at the railway station at the same time Through calculation to determine whether these three schemes are feasible, if feasible, which scheme takes time?
- 9. How to calculate the simple operation of "3 / 4 minus 2 / 7 plus 1 / 4 plus 5 / 7"? Please make a formula, thank you!
- 10. A piece of A4 paper as a load bearing paper bridge A paper bridge made of A4 paper, 7 feet apart between two tables, can only use glue and scissors Note: it's not the kind of paper bridge where heavy objects are placed on the paper bridge, but the kind where heavy objects are placed on a board hung under the paper bridge Better get a reply on the same day! Oh, oh Wrong It's inches --||||| Inch sounds so much like feet that I always make mistakes|| It's hung with a rope. There's no base. The weight is iron
- 11. How to understand the definition of equivalence, similarity and contract matrix in line generation? 1. Equivalent matrix If the rank of a and B are equal, then a and B are equivalent, that is to say, any two matrices of the same type with the same rank pass through All elementary transformations can be transformed to be equal to each other? 2. Similarity, contract matrix How to understand the definition of p-1ap = B; p'ap = B? Why multiply an inverse matrix on the left and multiply an original matrix on the right? What's the geometry of these three relationships? --------------------------------------- No one understands? Answer as much as you know! --------------------------------------- Back to the third floor: What I want to know is about the source of the definition. --------------------------------------
- 12. 1-2 + 3-4 + 5-6. + 199-200 + 201 is equal to?
- 13. Let n eigenvalues of n-order square matrix a be different from each other, and n-order square matrix B and a have the same eigenvalues?
- 14. It is stipulated that △ is a new operation symbol, and a △ B = A & # 178; - a × B + A-1, for example, 2 △ 3 = 2 & # 178; - 2x3 + 2-1 = 4-6 + 2-1 = - 1 Please try to find the value of (1) 4 △ 5 according to the above regulations (2) The value of (- 2) △ (- 3)
- 15. As shown in the figure, in ladder ABCD, ad ∥ BC, ∠ DCB = 45 °, CD = 2, BD ⊥ CD. Through point C, make CE ⊥ AB to e, intersect diagonal BD to F, point G is the midpoint of BC, connect eg and AF. (1) calculate the length of eg; (2) verify: CF = AB + AF
- 16. 5+10+15+20…… +95 + 100 + 105 = how to calculate
- 17. It is known that three numbers form an arithmetic sequence, the sum of which is equal to 24. If the third number is added with 4, then the three numbers form an arithmetic sequence, and the three numbers can be calculated
- 18. How to find the unit's "1" quantity? Let's try to talk about the front or back of what word
- 19. Solve equation 22.5-4x = 12.5
- 20. What is the 108th power of 3