Giúp tôi giải toán và làm văn

Nguyễn Thành Long 31/12/2017 lúc 10:04
Báo cáo sai phạm

Gọi tổng đó là aaa(aaa thuộc N*)

Ta có:


                   (n+1)x((n-1):1+1) : 2=a x 111

                   (n+1) x n:2=a x 3 x 37

                   (n+1) x n=a x 2 x 3 x37

suy ra : (n+1)n chia hết cho 37

suy ra n thuộc {36;37;73;74;....}

Vì 1+2+3+4+...+n=(73+1)73:2=74 x 73: 2=2701(Loại)

suy ra :n<73

suy ra : n thuộc {36;37}

+n=36   Suy ra n+1=37   Suy ra (n+1)n:2=666(Thỏa mãn)

+n=37   Suy ra n+1=38   Suy ra (n+1)n:2=703(Loại)

Vậy n=36

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Đoàn Thị Bình 31/12/2017 lúc 09:46
Báo cáo sai phạm

Nếu tổng của n thứ tự tự nhiên đầu tiên bắt đầu bằng 1 là một số 3 chữ số với các chữ số giống nhau, tìm n.

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lyli 17/11/2017 lúc 19:49
Báo cáo sai phạm

bài  này là bài tiếng anh đúng ko zậy trả lời bằng t.a nha

we need bring a packbag , a coat ,  walking boots , fast food and drink , phone , ......

nhớ nha ( mik cũng hay bị đăng câu hỏi xong ko có ma nào trả lời hết trơn hà hihi)^^

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Nguyen Viet Anh 18/11/2017 lúc 20:13
Báo cáo sai phạm

Nhiều thứ lắm

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Hoàng Nguyễn Như Mai 17/11/2017 lúc 19:04
Báo cáo sai phạm

sao hổng ai trả lời zậy

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nguyenvankhoi196a 31/10/2017 lúc 12:53
Báo cáo sai phạm


mk chắc chắn

tk cho mk nhacô gái lạnh lùng

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nguyễn hoàng tiến 27/11/2017 lúc 21:42
Báo cáo sai phạm

D nha

                   cô gái lạnh lùng

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tuyet hoa 01/11/2017 lúc 16:13
Báo cáo sai phạm

D là bạn mau thứ gì cũng được hết

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Lê Ngọc Quý Châu 31/10/2017 lúc 12:54
Báo cáo sai phạm

1.smaller       2.big         3.good         4.happy(giữ nguyên)             5.high

Nói cho mà biết tui mới học lớp 5 thôi đó !

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Uyên Trần 31/10/2017 lúc 12:48
Báo cáo sai phạm

1. smaller

2.the biggest

3. better

4. the highest

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nguyen nhat hung 27/09/2017 lúc 21:20
Báo cáo sai phạm
Nguyễn Thị Hiền Trang 22/10/2017 lúc 15:41
Báo cáo sai phạm

my house has two room, a living room and a kitchen.

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Nguyễn Lê Tiến Huy 22/10/2017 lúc 15:38
Báo cáo sai phạm

cho mk hoi cau truc have/has nghia la "có" hay la thi hien tai hoan thanh z???

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Lưu Ngân Giang 22/10/2017 lúc 14:54
Báo cáo sai phạm

Tk nhi and hari

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i love hattori 21/10/2017 lúc 20:39
Báo cáo sai phạm

Play badminton ; volleyball ; table tennis ; tennis và rất nhiều từ khác nữa

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Trương Võ Hà Nhi 21/10/2017 lúc 20:37
Báo cáo sai phạm

play football

read books in the library

join activities

chat with your friends....

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nguyen thi hue 12/10/2017 lúc 16:43
Báo cáo sai phạm


My school is very excellent having red colour three storey building. I to go school on daily basis in the proper uniform. My class teacher is very kind and teaches us to follow school discipline. My school is located at very nice place and away from all the crowd and noise of the city. My school has two small green gardens near to the main gate where lots of colourful flower beds, grassy lawns, fruits trees and two beautiful showers.

My school has lots of facilities such as one computer lab, two science labs, one big library, one common reading room, one big playground, one nice stage and one stationary shop. My school has classes for nursery to 12th class students. My school has around fifty seven highly qualified teachers including men and women, 20 helpers, one principal and 10 gate keepers. My teacher teaches us very politely and makes us learn subjects in very creative and attractive ways.

2.My mother is the one who I love most in my life. For what she’s done, she deserved with the whole world. My mother is a 43-year-old household wife. She’s tall, slim and especially she has a beautiful long black hair. She always smile thus everyone consider her a friendly person. My mom loves every members of the family with all her heart. She agreed to be a household woman instead of working out. My mother takes care of the household chorces. She wakes up earliest in the morning and goes to bed latest in the night. And during the day, she’s very busy. I remember once when my mother got sick so nobody did the house work and everything went to crazy. From then, my father and I join hand to help mother whenever we have free time. She’s really happy about that. When I was a kid, mom taught me to play piano at each weekend. I still remember the songs which includes many childhood’s experiences. Not only taught me to play piano, she also taught me to be a better human. I love the moral stories that she told me before I fell asleep every night. We’re really appreaciate mother’s effort, patient and her hard work to conserve the family’s happiness. My mother is an indispensable part of my life. When I grow up, I want to be a woman her.


The name of my best friend is Jyoti. She is my good friend and cares for me a lot. She behaves me well and helps always. I met her in class 6 and became best friend. She is my true friend because she understands me very well and cares for my every need. I her very much. I never had any friend her ever before. She comes to my home and I too go to her home. Our parents respects us very much and our friendship. She is so precious for me and I never want to lose her. Whenever I get absent in the classroom, she helps me in doing all the left home works and class works.

She is much similar to me in many aspects. She never argues me and describes me well anything which I get stuck. She is an open minded girl and never feels bad for my misbehave. She is very entertaining in nature and makes me laugh through her interesting jokes and talks in the spare time. She is very cute and attractive, attracts everyone through her smile and nice way of talk. She promotes me always to do better in the classroom and exams. We are good in sports and academic activities. She takes my opinions in her every tough work to do in the right way. We manage to share things in our difficult times. We always perform better in the class tests and main exams.

chúc bạn học tốt nha 

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Đức Hải 12/10/2017 lúc 17:07
Báo cáo sai phạm

My favorite school is a beautiful school. It is a big and large school. The school has many trees and there has enough stadiums and sporting yards for students to play. The thing I expect the most, that is a great learning school with many modern equipments. One more thing, the students of the school are friendly and helpful and the teachers are good too. That's all of the school in my dream.
My favorite school is a beautiful school. It is a big and large school. The school has many trees and there has enough stadiums and sporting yards for students to play. The thing I expect the most, that is a great learning school with many modern equipments. One more thing, the students of the school are friendly and helpful and the teachers are good too. That's all of the school in my dream.

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Nguyễn Thị Hồng Hạnh 12/10/2017 lúc 16:59
Báo cáo sai phạm

1. Probably when referring to the school is a concept not far away for all of us.Ai also has a school in deep in his mind that where we can not forget the roof of the school love it.

For me Le Loi Primary School is a school that I love very much. The whole school is dyed yellow, it looks beautiful and when the sun shines it makes it more brilliant. When approaching you will see a school gate highlighted in blue "Le Loi Primary School". Although it has been many years, but the gate is still beautiful, as if welcoming everyone to the school. The school's blue gate was old when the security guard opened the door and pulled it in and it sounded funny. The gate is always open as a mother welcomes us into the world of knowledge of the word or right. Passing through the main gate is a small constellation, which is where the guard works and controls the student. Step into the magnificent school but still no lack of dignified ancient.

The school was built more than thirty years ago so it was quite old but it is the same old that makes the school becomes more beautiful with everyone coming here. The new schoolyard is paved with cement and should look white. In the school you will be walking through a row of long phoenix trees as if stepping into a paradise of nature. The young we tease each other is a tree of love. We also do not know it ever since I only know my dad said that since his father had school it already. Birds playing hide and seek on the branches of phantom make the scene becomes roman and shimmering miraculously. The school is built on two floors but is divided into two blocks which are one for grade one two three for grade four and fifth grade. The classrooms are decorated with very fun pictures. Each classrooms have decent chairs and tables with nice black décor. In the classrooms are hung photo and the five teachers are very neat, under the teacher's desk.

It's great to be in our 3a class. The space is beautiful and friendly, it is our warm school. The main place where we greet the flag and all our activities with the school are held here. The school has a lot of big trees shading under the rocky benches with hard-working schoolboys who are reviewing it. The arena is also where every time it is played it is colored by the game. We play often. On the side of the building for students in grades four and five are two computer labs for our informas.

On the opening days or the Vietnamese teachers' day we were welcomed by the alumni of our school which made us very honored. I am proud to be a student of a school named brother Le Loi national hero.

Le Loi primary school has imprinted my beautiful childhood. I can not forget this place.

2. In our daily lives, how many people are worth loving and spending so much? But have you ever thought, Who is your dearest?

For everyone, that answer could be grandparents, mothers, siblings, or friends. In my own image, the father will forever be the sacred fire, warm my soul after this.

My father is not as lucky as the other men. Throughout his life, he probably never lived in happiness.

Forty years ago, when he was half his life, he had to live with a lot of illnesses: First, it was stomach pain, and then there were more complications. Previously, when healthy, ever father is very stylish.

But now, the beauty seems to have changed: Instead of the arms rolling corn, now only a lean thin skin, shrink. Deep under eyebrows, two high cheekbones emerged on the blackened face of the wind.

However, illness can not lose the inside personality of father, father is always full of energy, rich self-confidence and love for family. My family is not well off, all expenses in the family depend on the money the parents earn daily.

Despite illness and illness, but Dad never surrendered fate. Dad tried to overcome the writhing pain to reassure everyone in the family, trying to make money with his labor from the hybrid car.

Everyday, my father had to go to work from early morning until the sun had fallen for a long time. My dad's hair began to melt in the early morning mist. It is easy for ordinary people but it is very hard and difficult for their dad. Now there are times when you have to travel long distances, the road to shock, the pain of his father recur.

And the days of weather change, there are sunny summer days to 38-48 degrees Celsius, or rainy days fluorescent monthIt was July, August, and the cold winter, still trying to stand under the shade of trees looking for customers across the street.
I am always proud and watching people when there is a rich man who is so devoted, committed, hard-working.
But got a complete. Mỗi ngày được định vị lại khi một cảnh báo lại. Looking at the face wrinkled, the pain that struggled to endure, I just burst into tears. For example you see, why I quiddle pain than thousand thousand. Daddy, how can you bring that pain to your father, if you can earn money, or know? If you do anything for the layout at this time to make the layout more fun, would you do it all, tell me?
That, I just hugged Daddy, rubbed oil for Daddy, I just wanted to go with me, I could vacation, so would save money for the family, I can make money and treatment for her . Canh, nếu bạn sẽ chắc là bạn sẽ bị hỏng.
Dad always said he would fight. Fight for the last effort to feed our school children. Dad is very interested in our study. The teaching day was very good but the poor had to leave school. In the evening, when not trying to walk, always guide the lessons on how to learn.
In the meal often remind us to live, how to make people right. I'm catering, book on thousands of words to Kiều, hundred roaming interpreter, reputation ...
Therefore, I will try to learn self-learning geometry. I will be a doctor and will cure my father, will make money to support his father and go on unfinished steps in his father's youth. I have always been grateful to my dad for giving me a bright path, because it is the path of education, not the dark path of money. I will always find ways to teach to live, take the creativity to follow.
I admire not only by a good person, is a senior person, earnest, patiently persevere but also alive by living, carefree father.
If you are free and you are very grown up and care in the garden before the garden for it will always be. These baskets include water every morning; What devices can carry on a leaf withered?
Which orchids, jasmine does not smell good? After you have a warming cover, care, does not much animals. My family always has puppies and a cat and always bring in beautiful cubs.
Furthermore, over the course of five years of living with the disease, I have not heard of death, but that does not mean avoiding the truth, always facing death. thời gian để tạo mọi tất cả bạn khi quá dài.
But life is always suffering, when the whole family grows up, when I can find money, then leave me, leave my mother, leave family to go to the world in.
Go to a place far and never see again.
Now when I stumble, I will stand up myself and follow my feet, because my father is far away, there will be no one to support me, protect me. Know that this is a cute girl? Why leave when you go Daddy?
But thank you also, Dad is given another lesson, it is on a weekly basis, let's do the key things, love the people around you, and especially ask. caring for the layout, forgiving the layout, when angry and angry with the layout is always our most loved.
Dad went away, went to another world, where the father will no longer sick, will escape this painful life. And rest assured, will always remember your father's teachings, will always love, respectful gratitude, will live the example that you have set out for me to go.
Your image will always bloom in your heart. Memories, feelings for children, I will hug, cherish, as my own soul.

3.I step on the familiar road. Today is so beautiful. Blue sky is not a cloud. The light yellow sunlight down the road makes me remember how much Mai.
That friend is not in the same school, nor in the same class, which I know in a special case.
Every afternoon after school, I saw a ragged girl selling popcorn. One day it was raining but the girl was still selling. Seeing the little girl who sold her wet clothes, I went close again, pulling her raincoat to cover you. On that day, as I went I asked:
-What is your name? Why do you go on sale every day?
She answered:
-My name is Mai. Because my house is so poor, I have to sell my burns to buy clothes and school supplies.
Actually my house is no better than the Mai. Suddenly, I suddenly remembered the shirt that grandfather gave him last year. No matter what, I immediately brought that idea to exchange with Mai, but Mai said:
-Thank you, but I want to work myself to make money to buy things.
Also, from day to day, I no longer see Mai selling burns anymore. Then one day, I met Mai again in a good student contest. Me and Mai hugged each other hugging each other, and then two children rushed into the preparation room. I sit right under Mai's desk. After a while, six beeps signaled the start of the test. At the beginning of the test I was able to do but a difficult math problem I think not. I looked up and saw Mai writing on the paper. My brow smiles. Suddenly a piece of round paper was thrown straight in front of me. I saw Mai wink at a signal. I know Mai thought to pick up but I remember once Mai said:
-Thank you, but I want to work myself to buy everything.
So I did not try to read anymore but tried to read the subject carefully to find the answer, and finally, I also found the answer. I write a circuit. It was time to finish all my exams. Come back, Mai approached me, said:
-Now you feel embarrassed so I want to help you, now I feel really regret. Better than we go and work with your legs and mind.
Me and Mai walk side by side.

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Trần kiên 18/09/2017 lúc 22:01
Báo cáo sai phạm

60+56 được bao nhiêu chia 

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Nguyễn Ngọc Minh Hoài 18/09/2017 lúc 21:24
Báo cáo sai phạm

mik dịch là: Trong số 90 thành viên câu lạc bộ, 60 người thích chơi tennis và 56 thích bơi. Tối đa có bao nhiêu thành viên trong câu lạc bộ này thích cả hai? Ít nhất có bao nhiêu người trong số họ thích họ cả hai?

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Những nàng công chúa Winx 30/08/2017 lúc 15:40
Báo cáo sai phạm

1 . The book is blue 

It is a blue book .

2 My room is bigger than your room . 

Your room is smaller than my room . 

3 Let's visit the Great wall of China 

What about visiting the Great wall of China . 

4 . Mai walks to work every day

Mai goes to work on foot every day .'

k mình nhé !!!!!

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Ánh 30/08/2017 lúc 15:52
Báo cáo sai phạm

đây là nơi để học toán

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Bùi Thái Hoàng 30/08/2017 lúc 15:41
Báo cáo sai phạm

1 It is blue book

2 is small than my room 

3 the Great wall of China 

4 to work by walk

tk cho mk nhé mk đang âm điểm

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Võ Hồng Đức 15/11/2017 lúc 21:20
Báo cáo sai phạm

bằng 18 đó bạn ạ

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Pikachu 15/11/2017 lúc 21:17
Báo cáo sai phạm

Thay x = 3 và y = 4 vào biểu thức 2x + 3y, ta có:

    2.3 + 3.4 = 18

Vậy giá trị của biểu thức là 18

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Bui Danh 15/11/2017 lúc 21:16
Báo cáo sai phạm

Thay vào ta có:2x+3y=2.3+3.4=6+12=18

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Đinh Đức Hùng CTV 13/11/2017 lúc 13:07
Báo cáo sai phạm

We have : 






The value of A is - 1 because \(abc=\frac{1}{2}\)

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Dưới đây là những câu có bài toán hay do Online Math lựa chọn.


Đố vuiToán có lời vănToán đố nhiều ràng buộcGiải bằng tính ngượcLập luậnLô-gicToán chứng minhChứng minh phản chứngQui nạpNguyên lý DirechletGiả thiết tạmĐo lườngThời gianToán chuyển độngTính tuổiGiải bằng vẽ sơ đồTổng - hiệuTổng - tỉHiệu - tỉTỉ lệ thuậnTỉ lệ nghịchSố tự nhiênSố La MãPhân sốLiên phân sốSố phần trămSố thập phânSố nguyênSố hữu tỉSố vô tỉSố thựcCấu tạo sốTính chất phép tínhTính nhanhTrung bình cộngTỉ lệ thứcChia hết và chia có dưDấu hiệu chia hếtLũy thừaSố chính phươngSố nguyên tốPhân tích thành thừa số nguyên tốƯớc chungBội chungGiá trị tuyệt đốiTập hợpTổ hợpBiểu đồ VenDãy sốHằng đẳng thứcPhân tích thành nhân tửGiai thừaCăn thứcBiểu thức liên hợpRút gọn biểu thứcSố họcXác suấtTìm xPhương trìnhPhương trình nghiệm nguyênPhương trình vô tỉCông thức nghiệm Vi-etLập phương trìnhHệ phương trìnhBất đẳng thứcBất phương trìnhBất đẳng thức hình họcĐẳng thức hình họcHàm sốHệ trục tọa độĐồ thị hàm sốHàm bậc haiĐa thứcPhân thức đại sốĐạo hàm - vi phânLớn nhất - nhỏ nhấtHình họcĐường thẳngĐường thẳng song songĐường trung bìnhGócTia phân giácHình trònHình tam giácTam giác bằng nhauTam giác đồng dạngĐịnh lý Ta-letTứ giácTứ giác nội tiếpHình chữ nhậtHình thangHình bình hànhHình thoiHình hộp chữ nhậtHình ba chiềuChu viDiện tíchThể tíchQuĩ tíchLượng giácHệ thức lượngViolympicGiải toán bằng máy tính cầm tayToán tiếng AnhGiải tríTập đọcKể chuyệnTập làm vănChính tảLuyện từ và câu

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Tài trợ

Các câu hỏi không liên quan đến toán lớp 1 - 9 các bạn có thể gửi lên trang web để được giải đáp tốt hơn.

sin cos tan cot sinh cosh tanh
Phép toán
+ - ÷ × = ∄ ± ⋮̸
α β γ η θ λ Δ δ ϵ ξ ϕ φ Φ μ Ω ω χ σ ρ π

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