Seven questions on Mathematics in the world
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- 1. In the number of columns 1, - 3,5, - 7,9, - 11 ~ at least take out a few numbers to make the sum equal to 0 I'm in urgent need. I hope those who can answer
- 2. A four digit integer is first rounded to ten, then rounded to hundreds, and then rounded to thousands. At this time, the number is the third power of 3 * 10. What is the maximum and minimum value of this number! Please tell me how to calculate it
- 3. There are five glass balls in each of three colors in the bag. If you feel at least a few glass balls, you can guarantee that there are two kinds of glass balls in the same color?
- 4. It is known that: as shown in the figure, ∠ B = ∠ C = 90 °, M is the midpoint of BC, DM bisects ∠ ADC. (1) prove that am bisects ∠ bad; (2) try to explain the position relationship between DM and am? (3) What is the relationship between CD, AB and ad? Write the results directly
- 5. The sum of three consecutive even numbers is 3a, and the smallest of the three numbers is 3a______ The biggest is______ .
- 6. If there is a point on the right branch of hyperbola x2a2 − y2b2 = 1 (a > 0, b > 0), and the distance from it to the right focus and the left quasilinear is equal, then the value range of eccentricity of hyperbola is () A. (1,2]B. [2,+∞)C. (1,2+1]D. [2+1,+∞)
- 7. If there is a point on the right branch of hyperbola x2a2 − y2b2 = 1 (a > 0, b > 0), and the distance from it to the right focus and the left quasilinear is equal, then the value range of eccentricity of hyperbola is () A. (1,2]B. [2,+∞)C. (1,2+1]D. [2+1,+∞)
- 8. (x2-2xy + Y2) - (x2 + 2XY + Y2) = what
- 9. 2xy-x2-y2+9 Decomposition cause death form
- 10. What is the sum of [1 / 2XY + Y2 + 1] + [x2-1 / 2xy-2y2-1]
- 11. Mathematical sequence, finding the law 1,3,2,6,5,15,14,x,y,z,122…… The values of X, y and Z are? What are the rules in this series?
- 12. How to make sentences at dawn?
- 13. Uncle Li's family has 120 chickens, one sixth less ducks than chickens. How many ducks are less than chickens? How many ducks does Uncle Li's family have?
- 14. Human health guard
- 15. 45 and 46 common factors
- 16. Translation of section B and 3a in unit 1
- 17. Delete a number in the following sequence to change its range rule: 359 13 18 27 33 81 89
- 18. Please look at my English book English translation
- 19. How to calculate (50 * 2 + 49) + (49 * 2 + 48) + (48 * 2 + 47) + (47 * 2 + 46) +. + (2 * 2 + 1) + 2
- 20. Xinhua Bookstore imported 2800 literature and art books, 175 less than 7 / 8 of the science and technology books. How many science and technology books did the bookstore import? Use the equation to solve the problem