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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?
Take it home and make it up!
400 words name: xiaomingshu: 100000 why
emergency
There are many interesting things and unforgettable things in the Reading Festival. One of the most unforgettable things is to donate books. Remember that time, after school, the teacher said to everyone: "tomorrow, we will donate books for the students of hope primary school, and by the way, we will donate books to the class book corner. Please make sure you bring books!" and then we scattered
Reading and exploring: Xiaoming saw such an introduction in "100000 whys: universe chapter": "in 1932, British physicist Chadwick boldly predicted
Reading exploration:
Xiao Ming saw such an introduction in "100000 whys: the universe"
"In 1932, British physicist Chadwick boldly predicted that there might be a kind of star in the universe, which is directly composed of neutrons. Thirty years later, astronomers discovered the pulsar and proved it to be a neutron star, thus confirming the prediction of this genius.
Neutron star is a very dense object: water is the most common material on earth. The density of white dwarfs in the universe is about one million times that of water, and the density of neutron stars is about one hundred million times that of white dwarfs.
In fact, a neutron star is the product of a terrible supernova explosion in the later years of a massive star. It is the remnant of a pitifully small, dense and lifeless star
Try to estimate the mass of a neutron star about the size of a ping-pong ball?
Because: the density of white dwarfs in the universe is about one million times that of water, and the density of neutron stars is about one hundred million times that of white dwarfs, so: the density of white dwarfs is about one hundred trillion times that of water: 10 ^ 14 tons / cubic meter. Because: the volume of a ping-pong ball is about 30 cubic centimeters, that is 3 * 10 ^ - 5 cubic meters, so: a ping-pong ball sized neutron star matter
-Factorization of 5A (B-A) - B (a-b)
-5a(b-a)-b(a-b)
=（b-a)(b-5a)
Orange, apple and pear are 160 kg in total. The ratio of orange to apple is 5:6. The quality of pear is three tenths of that of apple. How many kg of each of the three kinds of fruit
Apple 160 (1 + 5 / 6 + 3 / 10)
=160÷32/15
=75 kg
Orange 75 × 5 / 6 = 62.5kg
Pear 75 × 3 / 10 = 22.5kg
A number 13 is 6. How much is it to increase the number by 12?
6 ÷ 13 × (1 + 12) = 6 × 3 × 32 = 27. A: if this number is increased, its 12 is 27
1.(1)600mis=_______ s (2)2h=________ s (3)100ms=______ s (4)1ms=________ us (5)150min=_________ The eighth power of H (6) 10=__________ S 2. (1) the eighth power km of 7.2 × 10=________ um =_________ Cm (2) 5.6 × 10 to the sixth power nm = --- km = --- cm (3) 3.8 × 10 to the fifth power um = --- cm = --- km 3. (1) 120 km / h = 1 m / S (2) 1 m / S = 1 km / h (2)
1. (1) 600mis = 36000s (2) 2H = 7200s (3) 100ms = 0.1s (4) 1ms = 1000US (5) 150min = 2.5h (6) the 8th power of 10 US = 100s 2. (1) the 8th power of 7.2 × 10 km = 7.2 × 10 17th power um = 7.2 × 10 13th power cm (2) the 6th power of 5.6 × 10 nm = 5.6 × 10 - 3rd power km = 5.6 × 10
1. The fruit store shipped 1000 kg of apples, and sold one twentieth of the total on the first day, and sold 85 kg on the second day. How many kg were sold in two days?
2. There are 180 kg of white sugar. One ninth of the total sugar is used in the first day, and three fourths of the total sugar is used in the second day. How many kg are used in the second day?
Two days sold a total of 1000x1 / 20 + 80 = 50 + 85 = 135kg
The next day, 180x1 / 9x3 / 4 = 20x3 / 4 = 15kg
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1 / 2, 1 / 4, 1 / 8, 1 / 16, 11 / 16, (), () (fill in the rules)
Multiply the denominator by two
So the next two are one in 32, one in 64
The rule of vector addition in vector and scalar?
The addition of vectors satisfies the triangle rule
In vector translation, the head of the first vector is connected with the tail of the second vector, and then the head of the first vector and the tail of the second vector are connected to form a triangle. The third side is the vector added
RELATED INFORMATIONS
- 1. 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
- 2. Xiao Ming's birthday, his father gave him a gift, why did he lose it?
- 3. 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
- 4. 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
- 5. 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?
- 6. 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?
- 7. 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
- 8. 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?
- 9. 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)
- 10. Dongdong is 12 years old this year, but he has only had three birthdays. He is______ Month______ He was born on the 15th
- 11. 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?
- 12. 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?
- 13. 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
- 14. 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?
- 15. 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
- 16. 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?
- 17. 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?
- 18. 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?
- 19. For painting training, Xiao Qing goes every six days, and Xiao Hong goes every eight days. After they train at the same time on July 10, at least how many months will they meet again? Party A and Party B go to borrow books. Party A goes every six days and Party B goes every eight days. If they meet in the library on March 5, what month and day will they go to the library next time?
- 20. The new library is open. X goes every three days. X goes every four days. After X and X3 meet in the library on March 4, what is the fastest time for them to meet again?