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Xiao Ming's birthday, his father gave him a gift, why did he lose it?
Because he didn't like it,
Please accept if you are satisfied
On Xiao Ming's birthday, his father gave him a birthday present, but Xiao Ming kicked it away. Why did Xiao Ming kick it away?
The birthday present is football
On Xiao Ming's birthday, dad bought a box of birthday cake (as shown in the picture) with a diameter of 40cm,
Tie a cylindrical cake box with a plastic rope. The knot is just at the center of the bottom. The knot is 10 cm long and 40 cm in diameter,
(1) Label the whole side of the cake box. What is the area of the label paper at least?
(2) What's the volume of the cake box?
(3) How many centimeters of rope does it take to tie this cake box? (the rope at the knot is 20 centimeters long)
(1) Label the whole side of the cake box. What is the area of the label paper at least?
14 × 40 × 20 = 2512 (cm2)
(2) What's the volume of the cake box?
3.14 × (40 △ 2) ^ 2 × 20 = 25120 (cubic centimeter) ^ 2 means square
(3) How many centimeters of rope does it take to tie this cake box? (the rope at the knot is 20 centimeters long)
40 × 4 + 20 × 4 + 10 = 250 (CM)
(1) X = 10Y, 3x-2y = 12 (2) x = 7,2x-3y = - 4 (3) 2x + y = 32,2x = y I'll use it today
（1)
Substituting x = 10Y into 3x-2y = 12
3*10y-2y=12
28y=12
y=3/7
x=30/7
(2) Substituting x = 7 into 2x-3y = - 4
14-3y=-4
3y=14+4
y=8
x=7
(3)2x+y=32,2x=y
Y = 2x
2x+2x=32
4x=32
x=8
y=2x=16
The best English words
The more questions, the better
The most beautiful 70 English words
1. Mother
Passion
3. Smile
4. Love
5. Eternity
Fantastic
7. Destiny
8. Freedom
9. Liberty
10. Tranquility
Peace
12. Blossom
13. Sunshine
14. Sweetheart
15. Gorgeous
16. Dear cherish
17. Enthusiasm
18. Hope
Grace
20. Rainbow
21. Blue
Sunflower
Twinkle, twinkle
24. Serendipity discovery
25. Bliss
Lullaby lullaby
27. Sophisticated
28. Renaissance
29. Cute
Cosy comfortable
31. Butterfly
32. Galaxy
Hilarious
34. Moment
35. Extravaganza Entertainment
36. Aqua Water
37. Tender feelings
Cosmopolitan
39. Bubble
40. Pumpkin pumpkin
41. Banana
Lollipop lollipop
43. If
44. Bumblebee
45. Giggle
46. Paradox
47. Delicacy
48. Peek-a-boo
49. Umbrella umbrella
50. Kangaroo
51. Flabbergasted
52. Hippopotamus Hippopotamus
53. Gothic
54. Coconut
55. Smashing excellent
56. Whoops!
57. Tickle, tickle
58. Loquacious
59. Flip flop flip flops
60. Smithereens fragment
61. Hi to get attention
62. Gazebo Pavilion
63. Hiccup
64. Hodgepodge
65. Shipshape
66. Explosion
67. Fuselage
68. Zing vitality
69. Gum
70. Hen Night women's singles party
See the link below for details!
Mr. Chen, Mr. Wang and Mr. Liu are teachers of six subjects of Chinese, mathematics, English, P. E., music and fine arts in a class, each of whom teaches two subjects
(1) English teachers and math teachers are neighbors;
(2) Mr. Chen likes to talk with PE teachers and math teachers;
(4) PE teachers are older than Chinese teachers;
(5) Mr. Wang, music teacher and Chinese teacher often go swimming together
Can you name the two courses that three people teach respectively?
Miss Liu: Mathematics and Chinese
Mr. Chen: English and music
Mr. Wang: sports and fine arts
Please accept
Let the function y = f (x) be determined by the equation x + y = e ^ y, and find dy / DX
Two sides of X are derived
1+y'=y'e^y
So dy / DX = y '= 1 / (e ^ Y-1)
74 × 9.9 (how to calculate easily)
Original formula = 74 * (10-0.1)
=740-7.4
=732.6
The general term formula of 2,2,4,4,6,8,8,16
If 2 and 1 / 2 is the first term, then the general term is 2n and (1 / N of 2)
On the electron cloud in atomic structure
As we all know, there are two kinds of d-orbitals, so for an atom with only one electron in the d-orbitals (such as No. 21 atom), should there be two kinds of electron probability distributions?
The energies of the two d orbitals are different~~
In the ground state, it only moves in the orbit with the lowest energy. The electron needs energy to move to another orbit (this process is called transition). At this time, the electron is in the excited state, which is unstable. It will jump back to the ground state and release energy~
If you don't understand, look at quantum chemistry ~ if you don't understand, look at structural chemistry ~ ~ if you don't understand, you can only look at inorganic chemistry~~
RELATED INFORMATIONS
- 1. My father bought a cylindrical birthday cake for my daughter Yuanyuan. Yuanyuan wanted to cut the cake into several pieces (no less than 10 pieces) that were not necessarily equal in size, and give them to 10 children. If she cut the cake vertically, she should at least cut it______ A knife
- 2. Xiaoxiao's birthday, dad bought a birthday cake. Xiaoxiao ate 1 / 6, Dad ate the rest of the 1 / 5, mom ate the rest of the 1 / 4, who ate more cake
- 3. Xiao Ming borrowed 1000 yuan from his parents, bought a pair of shoes, used 970 yuan, and left 30 yuan. He gave 10 yuan to his father, 10 yuan to his mother, and 10 yuan to himself. So he still had 490 yuan to his father and mother, a total of 980 yuan, and his 10 yuan was only 990 yuan. Why?
- 4. Xiao Li originally planned to finish reading a book in 10 days, while Xiao Gang originally planned to finish it in 12 days. How many times does Xiao Gang read this book every day compared with Xiao Li?
- 5. A book is planned to be finished in 10 days, because it has 9 more pages per day. As a result, it has been finished in 8 days, and there are several pages in the book
- 6. Xiaohua likes to watch "100000 whys". This week, he planned to read 80 pages, but actually read 110 pages. How many more pages did he actually read than he planned?
- 7. Xiao Gang opens another calendar. He finds a number and adds it up with the four numbers above, below, left and right to get 80. He asks Xiao Ming to name the five numbers (solved by linear equation of one variable)
- 8. Dongdong is 12 years old this year, but he has only had three birthdays. He is______ Month______ He was born on the 15th
- 9. Dongdong is 12 years old this year, but he has only had three birthdays. He is______ Month______ He was born on the 15th
- 10. The school bought 230 new books of three kinds, of which children's books are twice as much as popular science books, and story books are one third of popular science books?
- 11. Xiao Ming's father gave him a birthday gift box on his birthday. He knows that the length, width and height of the gift box are 40cm, 30cm and 10cm respectively. If the gift box is tied up with ribbon (the ribbon at the knot is 18cm long), how many centimeters of ribbon do you need
- 12. Xiaofang went to the school reading room to borrow the book "100000 whys". When she took it home, she found that there were several broken pages in it. If she didn't mend it, she would send it to me Xiaofang went to the school reading room to borrow the book 100000 whys. When she took it home, she found that there were several broken pages in it. If she didn't mend it, she might fall down and become incomplete. If she mended it, the students would mistakenly think that she broke the book. What should we do?
- 13. 45. A, B and C go to the swimming pool for training regularly. A goes to the swimming pool every four days, B goes to the swimming pool every six days and C goes to the swimming pool every nine days?
- 14. A, B and C are friends. They go to the library every other day. A goes to the library every three days, B every four days and C every five days The three of them met in the library. At least how many days later will they meet again in the library?
- 15. A and B go to the library to borrow books. A goes every four days, B goes every five days. If they meet in the library on July 20, they will go to the library at the same time next time
- 16. Four of them go to the library to borrow books. A goes every five days, B goes every 11 days, C goes every 17 days, and D goes every 29 days. If they meet in the library on May 18, what month will they meet next? A10.18 b10.14 c11.18 d11.14 A, B, C and d go to the library to borrow books. A goes every five days, B goes every 11 days, C goes every 17 days, and D goes every 29 days. They met on May 18. When will they meet next?
- 17. If LGA LGB is the two real roots of the equation 2x ^ 2-4x + 1 = 0, find the value of LG (AB) * LG (A / b) ^ 2
- 18. Xiao Hong goes to the library every five days, Xiao Li goes to the library every six days. They go to the library at the same time on Sundays. How many days at least will they meet again in the library?
- 19. A and B go to the library to borrow books. A goes every 4 days, B goes every 6 days. If they meet in the library on January 10, what's the next meeting?
- 20. Xiao Ming, Xiao Hua and Xiao Qing often go to the library. Xiao Ming goes to the library once every two days, Xiao Hua goes to the library once every three days, and Xiao Qing goes to the library once every four days I went to the library. Do you know the next time they will go to the library together?