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LD
2
27 tháng 4 2018
Nhớ rằng: \(\frac{n}{a.\left(a+n\right)}=\frac{1}{a}+\frac{1}{a+n}\)
Ta có: \(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{90}\)
\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)
Áp dụng công thức trên, ta có:
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)
\(A=1-\frac{1}{10}=\frac{9}{10}\)
MT
1
24 tháng 5 2019
\(A=\frac{1}{3}.\left(\frac{3}{2.4.6}+\frac{3}{4.6.8}+...+\frac{3}{22.24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{4.6}+\frac{1}{4.6}-\frac{1}{6.8}+...+\frac{1}{22.24}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\frac{77}{624}\)
\(A=\frac{77}{1872}\)
S
10
LT
3
TB
15 tháng 2 2022
A)\(\frac{3}{5}:\frac{3}{4}=\frac{4}{5}\)
B)\(\frac{1}{4}:\frac{1}{2}=\frac{1}{2}\)
HT
@@@
L
5
HN
2
8 tháng 10 2018
A new Sunday starts. This is also the day that I can help my mother do the housework that her mother alone to suffer each day.
When it was getting dark, I got up. Chao! Sunshine today too beautiful. I happily clean my face, exercise, and start a new day.
I took food to eat chicken, the pig in the cage to jump up the city jealousy with the chicken. I told:
- Wait for the session also!
My Sunday
When the chicken is eaten, I take the bran for the pigs to eat. When it is not stretching it is not lying down but lying down on the pen to look happy. The hen boys continue to call their children to the garden to earn more food. Feeding my cattle, I took the brush. My mother has made ready meals and went to the field with my father for a long time. I rushed to my little room. It's going to wash my face, but it's not going to be because my mother does this work every day, not me. I will always keep it fresh. Washing my face, I took the toy out for him to play and then I studied. Just learned a little that it was crying over the belly. I took the rice to feed it but it did not tolerate me feed for food. Seeing that, I said,
- For her to feed and then tell the story for the baby!
He loves to listen to storytelling, so eat two bowls of rice, eat it and ask me to tell the story, I said:
- Go to the hammocks and then tell the story.
It's up to the hammock, I say. The story is not over, it has been sleeping since. Seeing that, I cleaned my house and studied. When I finish the lesson, I bring rice to my parents. The field in the spring crop is beautiful. My parents are harvesting rice. He bent down with gentle movements. I went to my mother, saying softly:
- Mom, eat rice!
Mother looked up and looked at me and told me to cook on the shore. I left then leave. Come to my house invited some friends in the neighborhood to play. In the evening, the sunlight faded, I took the pot to cook rice, warm up the food. Then mix the bath water for baby Ha. When I finished, I led him to the gate to welcome his mother. Mother came home, she ran out into mother's womb. Mother fragrant said:
- At home who shower for me?
He answered hesitantly:
- who ...
Mother led him into the house, I asked:
- Where are you?
Mother said:
- Dad is walking behind him!
Slowly outside the gate is coming back. I told her to take a good bath and eat rice.
- ... ... ... ai ai ai ai....
- Cai Ha in the meal.
Mother said:
- Today I cook delicious rice too!
My sunday
I know my mother said to reward my efforts. Finished, the sky was rolling, the family happily gathered around the large lamp placed in the middle of the table.
So that was a Sunday, so I was so short on Sunday. I only have this day to help my parents. And today, I have accomplished my task. I promised myself that I would help my parents when their work was finished, no matter what day it was, not on Sunday today.
TR
16 tháng 6 2021
Are you eager to look forward to the weekend me? After a stressful studying week, I am eagerly looking forward to the weekend to be able to have fun, or even to sleep so I don’t have to worry about tomorrow. The feeling of being able to have fun without having to worry about going to school tomorrow or doing homework is great for us. And so my two weekends were really meaningful with many entertainment schedules. Saturday will be the day I get off in the afternoon because I still have to go to school to study and class in the morning.
After class is usually the afternoon I will go to the supermarket and buy the necessary items or sometimes just to go eat roast chicken or really tasty snacks and watch movies. the movies that were shown in the theaters were so cool, so we asked our classmates to hug a girl with a coke and bring them into the movie, there are days when we watch action movies with beautiful plays, or sometimes funny and amusing comedies. We especially avoid watching emotional dramas for fear of being in the same mood and making our weekends more sad.
Coming out of the theater, I rushed into the street sausage skewers to sniff the smell of meat and sip the meat with chili sauce and so felt endless happiness with a great Saturday. The evening will be interesting programs at home, that night I do not need to touch the books and parents are not screamed the other days, because that day I will be relaxed. The whole family sat around the pot of boiled corn in November, and together they talked, sometimes with the neighbors and friends working and playing karaoke.
So Saturday went by and I slept again on Sunday and that’s what I wanted for the whole week, the days I had to wake up very early to get ready for school. On Sundays, I would hang out with my parents and children or go out with friends in some nearby parks.
My weekend will be that, and after two weekends to relax, I will be shocked to start the next week. It is my weekend, how about you, wish you a happy and meaningful weekend to start a new week full of energy!
NQ
16
18 tháng 5 2021
Ông em năm nay đã ngoài sáu mươi tuổi. Mái tóc ông đã điểm nhiều sợi bạc. Trước khi nghỉ hưu, ông đã là bác sĩ. Ông luôn yêu thương bệnh nhân hết lòng. Em rất yêu ông vì ông là người nhân hậu và luôn yêu thương con cháu. Những lúc em làm sai, ông không la mắng mà nhẹ nhàng dạy bảo em. Em mong ông có thể sống lâu trăm tuổi.
18 tháng 5 2021
Mk search nha !!
Ông nội của em năm nay đã bảy mươi tư tuổi. Nhưng ông vẫn còn minh mẫn lắm. Trước khi nghỉ hưu, ông em là một cán bộ nhà nước. Ông rất yêu thương con cháu. Nhưng ông cũng rất nghiêm khắc khi chúng em mắc lỗi. Tuy tuổi đã cao nhưng ông vẫn còn rất khỏe. Hàng ngày, ông đều dậy sớm để đi bộ. Sau đó ông còn đưa em tới trường. Em rất yêu quý ông nội của mình.
DD
4
27 tháng 7 2019
Bài 1: Đặt câu với những từ sau:
1. Fast: Run fast ( ko chắc đặt đại )
2. Noisily: The airport is very noisily
3. Clearly: Her mind is so clear !!! ( đặt theo nghĩa thoi ; sai đó đừng để ý ^^ )
hc tốt
IL
3 tháng 9 2018
Long, long ago in Vietnam there lived an ancient King, his name was King Hung Vuong. He was a wise and thoughtful king who always tried to please his people and consider new ideas and because of this he was loved by his people. King Vuong grew old and he knew that soon it would be time to pass his kingdom on to his successor, the only trouble was the King Vuong had three healthy sons and he did not know who would be the best choice to be King. King Vuong being a wise and caring King thought very hard about this problem and in due course came upon a solution.
He called his three sons together and he rose up to his feet and declared; "Sons you are all wise and strong but only one of you can rule our precious Vietnam. So, I have devised a plan to determine which of you shall rule after my passing." All of the members of the court and his three sons listening attentively because King Vuong was known to be the wisest ruler in the whole of Asia.
King Vuong continued; "I would each of you to provide for me a dish of food, you must search for the ingredients and make the dish and serve it to me on the last day of this Lunar Month, and on the basis of this dish I will decide who is to be the ruler of our Kingdom."
Immediately the words had left this King's mouth, the attendants at the court began to talk in hushed whispers. They knew that this was a very wise pronouncement of their King because Vietnam with its large population and small land area must always give attention to food production to make sure that each person is well fed and healthy.
The three brothers stared in disbelief; "How could our father suggest such a method of deciding, why does he not test our strength?" said the first brother. "Why does he not he test our computational skills?" said the second brother surprisedly. The third and youngest brother just looked at the court and his father and made no comment.
Within days the two elder brothers had organized their servants and horses and carriages and were racing all over Vietnam and even to other parts of South East Asia to find the most delectable and delicious ingredients for the dish. One brother took a boat out into the South China Sea to fish for the finest tasting fish, the other brother went into the Khmer Mountains to find the most tender boar meat. Yet, Prince Tiet Lieu stayed at home and sat on his front step and pondered his father's request.
By the end of the Lunar Month each of the brothers had prepared their dishes and came before the whole of the Vietnamese royal court and their wise father King Vuong to present it. The first brother came to the father and presented a fine porcelain dish of flying fish dressed in a sweet Chili sauce and accompanied by costly lotus seeds. A hush came over the court as the father viewed the dish and placed it on the table. The second brother came forward and he opened a large copper cauldron and presented a joint of boar dressed with wild mushrooms and a rare wild fern sauce. Again all the court watched the father place the cauldron on the table. Then Prince Tiet Lieu came forward and opened his basket and displayed a large flat rice cake. The court and his brothers gasped, no-one would dare offer such simple fare to the royal King Vuong.
King Vuong said, "Prince Tiet Lieu, tell me why you have chosen to present me with such a simple rice cake."
Prince Tiet Lieu said, "Rice is the most precious and valuable of all food found in this Kingdom, yet it is also the most abundant. I have prepared a dish that represents my love for you and our beautiful Vietnam. I have cooked it thoroughly then molded it into a round rice cake, and called it Banh Day as it symbolizes the sky we live under. I have cooked a square rice cake, stuffed it with cooked bean paste and ground meat in the middle and called it Banh Chung. This will symbolize the earth we live on."
As Prince Tiet Lieu spoke his two elder brothers tried to mask the grandness of their dishes as they now understood the wisdom of their younger brother in using ingredients that all the people of Vietnam could have access to. Immediately they fell to their knees in front of their father and younger brother and bowed at the same time the whole court bowed to the father and son as everyone knew that Prince Tiet Lieu would make the finest King to rule after his wise father King Vuong. After that, King Hung Vuong ordered that this recipe be passed out to all people in his kingdom.
As the result, the Vietnamese custom is that every year during the New Year celebration, the Vietnamese people cook Banh Chung and Banh Day and use them as special offerings to their ancestors as well as special gifts to relatives and friends during the Tet celebrations. The Banh Chung is very nutritious, has an original tasty flavor and may be kept for a long time. All of its ingredients and materials, from the green wrapping leaves to sky rice and pork, green peas and pepper inside, are all medicines (according to Oriental Medicine) that act to keep harmony between the positive and the negative, thus helping the blood circulate well and preventing diseases.
mk nha bn!CHÚC BẠN HỌC TỐT!
13 tháng 6 2018
I have a memorable childhood which has many experiences. One of the experiences I remember most is the first time I was invited to a birthday party. I was a 6-year-old girl and I had a bestfriend whose name is Lisa. We were very close and seemed we couldn’t live without each other until her birhtday. It was a beautiful morning when Lisa invited me to her birthday party and had no idea about how great her party would be if she didn’t ask me to attend. I was very happy and decided to make my bestfriend surprise by giving her a puppy as a present. Lisa didn’t dog or any animal but I almost forgot about that. I was confident to give her my present in her birthday and immediately realized that she didn’t my little dog which I myself chose to buy 3 days ago. While the party was going on, I stood in a corner of the room and watched how much she loved other normal presents such as teddy bear, dolls or crayons. I felt dissapointed but that was not the worst thing. About 20 mintues later, Lisa’s father gave a sign that was the time to taking out a birthday cake. It was the biggest birthday cake I had ever seen. The light went off. As soon as it went on, somebody screamed “It’s a puppy in the cake”. Everyone was surprise and they recognized that was my puppy. They looked at the puppy and then looked at me. I glanced to Lisa. She said nothing and about to cried. I was very confused and ashamed. I carried my puppy, said sorry to Lisa and ran out of the party. I couldn’t believe that I had just broken my bestfriend’s birthday cake because of a silly decision. I learned that never bring any animal with me to a party, especially bestfriend’s birthday party. It’s an experience that I won’t forget for the rest of my life. Luckily Lisa forgave me and we are still friend up to now. She always reminded me about her 6th birthday and we laughed a lot.
13 tháng 6 2018
My elder sister is going to study abroad in French in next August. I will miss her and all the experiences that we had been through together. When I was a kid, I hated my sister so much. My parents always said something nice about her but nothing that about me. Morever she treated she was an adult and I was not. That made me angry and also jealous. We fighted to each other everyday that was bothered my parents. I even told to my dad that I wished my sister was not exsist. My dad was very surprise and he known he had to do something. It was a Halloween night and my parents decided to go out so we were home alone. After 30 minutes from the moment my parents left, the light in my house suddenly went off. I was very scared and hold my sister’s arm tightly. She was scared too. When the light went on, a gaint ugly black monster appeared in the kitchen. He caught me as soon as I saw him. “Don’t leave me, please. Help me, help me”- I screamed out. My sister cried and tried to pull me away from the monster. He said “Give me your candies and I will let your sister go”. My sister ran upstair and looked for the candies and then she came back and gave the monster all candies she had. But he changed his mind and didn’t want to take candies any more. Instead he caught my sister and let me go. I was no longer afraid of that ugly monster. I hit him over and over. “You can’t catch my sister. Let her go, now. Can you hear me?” –I screamed. Finally he let my sister go and ran out of the house quickly. I hugged my sister happily and we realized that how much we loved each other. I told my father everything and he was very satisfied with us. He said “There are many other monsters outside. When you’re grown up, you will face to them everyday so you have to love each other to fight those monsters”. Then my father smiled and asked me “If your sister had not exsisted, who would have protected you from the monster?” I felt regret about my stupid treaty and grateful that she still was with me. For a long time later, we known that monster was my father but it didn’t matter. It’s an experience that I will never forget.
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