1. A cube has eight vertices, each of which has () edges, all of which are () Is there () edges of a pentaprism? A. Five B. ten C. fifteen D. twelve

A cube has eight vertices, and each vertex has (3) edges, all of which are (equal)
The number of edges of a pentaprism is (15)

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1. Mother bought 3 pots of roses and 2 pots of Mimosa, which cost 27 yuan in total. A pot of roses is 6.5 yuan more expensive than a pot of Mimosa. How much are each pot of roses and Mimosa?
2. 1+2+3+4+5+6+7+8+9+10+11…… +What is 49 + 50
3. If two numbers are multiplied, if one factor increases by 0.6, the product increases by 4.8; if the other factor decreases by 0.3, the product decreases by 1.8 I didn't learn X
4. From 1, 2, 3 How many of these 49 natural numbers can be taken out to make the sum of the two numbers 50?
5. There are three groups of numbers: (1) 1, 2, 3; (2) 0.5, 1.5, 2.5, 3.5; (3) 4, 5, 6. If one number is taken from each group and multiplied, then all of them have There are three groups of numbers: what is the sum of the products of all the three numbers in different ways?
6. 0.5 multiplied by a number The product is three decimal places, and the integral part of the product is 1. If you use the "rounding" method to get the approximate value, if you keep the integer, the product is 2; if you keep one decimal place, the product is 2.0; if you keep two decimal places, the product is 2.00. Find this number. It's better to answer before 9 o'clock tonight, please as soon as possible
7. If you add a number to the numerator and denominator of 5 / 23 at the same time, it will be about 2 / 3. What's the number
8. Take 2 numbers from the 100 natural numbers 1-100, what is the probability that their sum is less than or equal to 50? How to calculate? It's not the same after checking for a long time! I think we can only take two numbers from 1 to 49, because as long as there is one number greater than or equal to 50, we can't do it. So I think the numerator should be C above 2 below 49, and the denominator should be C above 2 below 100,
9. From 51 to 100, choose any 27 numbers, and the sum of two numbers must be equal to 152. Why
10. Take any 27 natural numbers from 1-50 nature books, and two of them must have a sum of 52. Why?
11. Does an octahedron have six faces, eight vertices and twelve edges
12. How many edges and vertices does a regular octahedron have Be more detailed What if there were more
13. The observation prism has 5 faces, 6 vertices and 9 edges. The quadrangular prism has 6 faces, 8 vertices and 12 edges. The pentagonal prism has 7 faces, 10 vertices and 12 edges It can be inferred that how many faces does the nth prism have? How many edges? How many vertices?
14. A seven prism has several vertices, several edges and several faces. What is the shape of the bottom
15. After the 8 vertices of a cube are cut off, a new geometry is obtained, which has a number of advantages______ Two noodles______ Two vertices______ The edge of the bar
16. An n-cube has () vertices and () edges
17. What is 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +... + 10000
18. What is 1.25 times 2 / 3 times 0.8? What is 1 / 2 plus 1 / 3 times 1 / 2 plus 1 / 3?
19. Proof of the sum formula of the first n terms of the equal ratio sequence When q = 1 Suppose A1 = 1, n = 2 Sum of the first n terms = 1 + 2 = 3 So the formula Sn = A1 * n is wrong I read fast, and mixed the equal difference with the equal ratio,
20. 1 + 3 + 5 + 7 +. + 2007 = the square of a few