Gọi thời gian để một mình người thứ nhất hoàn thành công việc là x (x>2; ngày)

Gọi thời gian để một mình người thứ hai hoàn thành công việc là y (x>2; ngày).

Trong một ngày người thứ nhất làm được 1/x công việc

Trong một ngày người thứ hai làm được 1/y công việc

Cả hai người làm xong trong 2 ngày nên trong 1 ngày cả hai người làm được 1/2 công việc. Từ đó ta có pt $\frac{1}{x}+\frac{1}{y}=\frac{1}{2}$ (1)

Người thứ nhất làm trong 4 ngày rồi người thứ hai làm trong 1 ngày thì xong công việc ta có pt:

$\frac{4}{x}+\frac{1}{y}=1$ (2)

Từ (1) và (2) ta có hệ pt $\{\begin{array}{c}\frac{1}{x}+\frac{1}{y}=\frac{1}{2}\\ \frac{4}{x}+\frac{1}{y}=1\end{array}\iff \{\begin{array}{c}\frac{1}{x}+\frac{1}{y}=\frac{1}{2}\\ \frac{3}{x}=\frac{1}{2}\end{array}\iff \{\begin{array}{c}x=6\\ y=3\end{array}$

Vậy người thứ nhất làm  một mình xong công việc  trong 6 ngày. Người thứ hai làm một mình xong công việc trong 3 ngày

lai

bài jjjjjj

Bìa 2 : Tìm các chữ số a,b sao cho :

a ) 14a8b chia hết cho 2 , 3 ; chia hết cho 5 và 9 ; chia hết cho 2,8,5 ; chia hết cho 4,7,9

b ) 34a5b chia hết cho 36 ; chia hết cho 45 ; chia hết cho 44

c )c71a3b chia hết cho 28 ; chia hết cho 5 , 7 , 9 ; chia hết cho 4 , 7, 9

ĐẾN 9H NHÉ . MK SẼ K CHO AI ĐÚNG ,NHANH VÀ KẾT BẠN VỚI MK

kb

hoc tot

kick nha

- Mk đã ngồi chơi fb và hít ko khí :33 trg lành :333

- mk á , Cho Cuộc sống :>>

- Mk đón Halloween vs mình 

- Mk thấy thấy bình thường 

- Có j mà sợ .-. ???

hôm đó là một ngày đẹp trời cả lớp tôi cùng nhau đi cắm trại và hóa trang . Mãi tới tối mịt mới về , trên duong di vang ve khong co ai . Vân reo lên :

- Các cậu ơi đằng kia có một ngôi nhà kìa ! Mình đến đây nghỉ tạm đi , roi sang mai di som .

toi va ca nhom tu tu di den can nha hoang . Trời đêm lạnh giá buốt hết tay chân . Đến nửa đêm thấy lạnh , tôi vào tìm trong đống quần áo hóa trang lấy và mặc tạm một bộ . Đến tờ mờ sáng , Huyền tỉnh dậy hình như không nhìn rõ mà thấy tôi cậu ấy hét toáng lên:

- A ! quỷ , quỷ , mọi người chạy ngay đi !

tieng het to qua lam moi nguoi tinh day . Không biết thế nào cả nhóm hùa nhau chạy trốn . tôi nghe thấy tiếng quỷ cũng chạy thục mạng. Cả nhóm cùng nhau chạy ra gần đường lớn thì tôi mới phát hiện ra là không có con quỷ , that bat ngo , toi dung lai hoi :

- quý đâu ?

Ca nhom sung sot :

Quỷ là mày đấy thằng quỷ !

Thấy vậy tôi mới kể lại đầu đuôi câu chuyện . ra là tôi lại mặc nhầm cái áo để hóa trang con quỷ . khi nghe xong cả nhóm ....!!!

Refer:

Once a poor fanner had a daughter named Little Pea. After his wife died, the farmer married again. His new wife had a daughter. Stout Nut. Unfortunately, the new wife was very cruel to Little Pea. Little Pea had to do chores all day. This made Little Pea’s father very upset. He soon died of a broken heart.

Summer came and went. In the fall, the village held its harvest festival. That year, everyone was excited as the prince wanted to choose his wife from the village. Stout Nut’s mother made new clothes for her, but poor Little Pea had none.

However, before the festival started, a fairy appeared and magically changed Little Pea’s rags into beautiful clothes.

As Little Pea ran to the festival, she dropped one of her shoes and lost it.

When the prince found the shoe, he decided to marry the gữl who owned

it. Of course the shoe fitted Little Pea. and the prince immediately fell in love with her.

Tham khảo!

A quarrel had arisen between the Horse and the Stag, so the Horse came to a hunter to ask his help to take revenge on the Stag.

The Hunter agreed, but said: “If you desire to conquer the Stag, you must permit me to place this piece of iron between your jaws, so that I may guide you with these reins, and allow this saddle to be placed upon your back so that I may keep steady upon you as we follow after the enemy.”

The Horse agreed to the conditions, and the Hunter soon saddled and bridled him.

Then with the aid of the Hunter the Horse soon overcame the Stag, and said to the Hunter: “Now, get off, and remove those things from my mouth and back.”

“Not so fast, friend,” said the Hunter. “I have now got you under bit and spur, and prefer to keep you as you are at present.”

If you allow men to use you for your own purposes, they will use you for theirs.

Bài dịch tiếng Việt

Một cuộc xung đột nảy lửa xảy ra giữa Ngựa và hươu, sau đó Ngựa đến gặp một gã thợ để nhờ gã bày cách trả thù hươu.

Gã nhận lời nhưng kèm theo điều kiện “Nếu mi mong muốn thắng Hươu như vậy, mi phải cho ta gắn miếng sắt này vào quai hàm của mi để ta có thể dùng dây cương điều khiển mi, bên cạnh đó phải có một cái yên trên lưng mi để ta có một chỗ ngồi vững khi chúng chúng ta săn đuổi kẻ thù”.

Ngựa đồng ý các điều kiện đó, thế là gã thợ săn nhanh chóng gắn yên và dây cương cho nó.

Sau đó nhờ những công cụ săn của gã mà ngựa đánh bại hươu một cách chóng vánh, Ngựa liền nói với gã “Nào giờ thì nhảy xuống và gỡ những thứ trên miệng và lưng của tôi ra đi nào”

“Đừng vội anh bạn”, gã nói ” bây giờ ta hơi mệt rồi và ta thích giữ nguyên hiện trạng này của ngươi hơn”.

Nếu bạn lợi dụng ai đó cho mục đích của bạn, họ sẽ lợi dụng bạn cho mục đích của họ.

On the old days, in the old winter, the winter was cold, the white snow fell like a cotton with a royal lady sitting on the windows of the ebony wooden frame, she looked at the snow so the needle stabbed her hand, three drops of blood fell to the snow.

Seeing red blood mixed with a beautiful snow into a beautiful color, she thought her stomach: "I wish I lay a girl, white skin like snow, red lips like blood and black hair like this door frame. She lay a white skin like snow, red lips like blood and black hair like ebony; So she named I was Snow White. Snow White has just been born, the mother dies.

A year later, the king married another. She is very beautiful but self-sufficient, cruel and doesn't want anyone beautiful with me. She has a mirror, when Soi, she asked:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Then the mirror:

- The queen, the most beautiful queen of the country.

Knowing the real mirror, she was very happy. But the bigger the snow white. At the seven years, she was like a fairy, more beautiful than the queen.

One day the Queen asked the mirror:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Then the mirror:

Older grandma most beautiful ceiling,
Today Snow White is more beautiful.

The Queen heard startled, jealousy rebelling. Since then every time I see Snow White, the queen is crazy.

The day of arrogance and jealousy caused her time to break. She called a hunter to say:

- Take this baby to the forest for my eyes. Kill it, bring his heart back here for me.

The person hunted the command, took her away. When I grabbed the knife to poise, the innocent girl cried:

- Uncle, I don't kill you, I would like to stay in the forest not about the castle anymore.

Seeing the beautiful girl too, Uncle Hunter Bao:

- Poor, just go. I think my stomach: "Then the beast also came to eat the meat it lost." But I saw it shaped a burden in my heart because she didn't have to kill him.

Just then a small child jumps. I killed my child, taking my heart to submit to the queen, lying to the heart of Snow White.

That cruel woman faltered the kitchen stir-fried with her eating. The Mu Dinh Ninh was the heart of Snow White, allowing it.

Alone Thui was in the deep forest. Snow White was scared, she kept plugging in the head, torning trees and sharp stones, flowing both blood. The porridge waded her around her, but didn't touch her. She went with her legs, dusily, saw a small house, immediately to leave.

In the house, something is small, but beautiful and clean. On the table with white scarf with seven children, a plate has a spoon, a cup of children. Turn on the walls of seven small beds covered with white towels like snow.

Snow White is hungry and thirsty, eating at each plate of a little vegetable, a little cake, and drinking every cup of wine, because she doesn't want anyone to lose the part. She was tired, wanting to go to sleep, but no bed lay, what was too long, the thing was too short. She tried to see the new seventh, so she slept.

In the dark, the new house owners are about: that's the seven dwarfs doing the mine work. They lit seven tops so up. They feel anyone went home.

A uncle said: "Who sitting in my chair?". The second uncle said: "Who ate on my plate?". Third uncle said: "Who ate my little cake?" Then said, "Who ate my little vegetables?". Thursday said: "Who used my plate?". Then said: "Who used my knife?" Seventh said: "Who will drink on my cup?"

A uncle looked around, then walked in her bed. Seeing the basket in the cushion, he said:

- Who climbed to my bed?

The other uncle also left his bed and said, "Does anyone lie in my bed?". The seventh look at the bed she saw Snow White sleeping. I called the other uncle. Everyone was surprised.

They picked up seven snow-white lights and shouted: "Lord! This girl is so beautiful. " The joy, let her sleep.

The next morning, Bach Tuyet woke up, saw the seven dwarfs, she panicked, but they intimately asked:

- What is her name?

She replied:

- I'm Snow White.

They asked again:

- Why are you here?

She told them what scabies wanted to kill her, who hunted was to let her live, she ran all day until they saw their houses.

The dwarfs told her:

- Do you want to help us with one hand, do things in this house? She will cook, make beds, wash, sew, embroider, sweep stripped, clean up. Stay here with us, she wouldn't miss anything.

Since then Snow White is with dwarfs. She did housewife work.

Early morning, the dwarfs into the mine took the ore and gold until the evening, Snow White made food ready for them to eat. Throughout the day, she was at home alone. The dwarfs tell her:

- Carefully prevent her scabies! How she knew she was here. Don't let anyone enter the house!

For the queen, she kept Dinh Ninh was eating the heart of Snow White, the most beautiful now.

She asked the mirror again:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Moors replied:

Older grandma most beautiful ceiling,
Today Snow White is more beautiful.
She at the mountain hidden,
At the home of the seven dwarfs far away.

She was startled because she knew that the mirror never said wrong, the hunter was deceived and the Snow White was alive. She thought about how to harm Snow White. She stood still 

his was not the most beautiful country.

After she found a successor: her face and dressed like an old woman selling clippings, no one realized. She disguised then reached seven mountains to the seven dwarfs the other, knocking on the door said:

- He has beautiful goods sold here.

Snow White looked out the window saying:

- Hi, Mrs. sell something?

- All is beautiful, fastener, bras Full color.

Then she let her see a pond lined with satin tunic iridescence. Snow White thought: "This is not a queen, I entered it." She came in and she opened the door to buy bra.

She told her:

- Son, forcing awkward too, come here, she was forced to.

Snow White is not a bit concerned, so she forced households. She forced briskly, too tight, Snow White could not breathe any more, fell to the ground, unconscious.

She said:

- It is the end of my life's most beautiful.

Then she hurried out.

Dark home to the Seven Dwarfs, Snow White found sprawled on the ground, motionless, the great panic. They lifted her up, see bras fasten too, he bisected out. She was breathing softly, then gradually rose again. After listening to her tell stories just happened, the dwarf told her:

- The old woman selling right there is an evil queen. She must be careful from now, we shall not have away from home for anyone to offline.

Reached home, she hurried to the mirror stepmother and asked:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Moors replied:

Older grandma most beautiful ceiling,
Today Snow White is more beautiful.
She at the mountain hidden,
At the home of the seven dwarfs far away.

Hearing this, the queen felt the blood boil because of anger, she knew that Snow White was rescued again. She said: "Well, how was I also counsel unless you". Then she witchcraft as a poisoned comb and even posing as an old woman other times before.

She took the seven mountains to the seven dwarfs go, wood door and say:

- She has beautiful goods sold there.

Snow White looked out the window, said aloud:

- She went away, I must not let anyone in it.

The old woman said:

- So who banned the watch anyway?

Then it stretched out to watch Snow White poisoned comb.

She likes to comb too, alluring ran out the door. The old woman said:

- To her beautiful brush slightly.

Snow White did not hesitate, let her hair. New hair combs to touch, Snow White was toxic, fell down unconscious.

Her son speak wickedness:

- The beautiful girl went home ma life.

Then she walked away.

Fortunately that time it was too late. Soon, the seven dwarfs. Find Snow White lying dead on the ground, they immediately suspected the culprit was her stepmother. They found Snow White comb on top. Just remove the brush, then Snow White back to life immediately after the incident to the uncle heard. The uncle told her to be careful. Anyone coming, do not open the door to enter.

Empress of the mirror to ask:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Mirror still answer as before:

Older grandma most beautiful ceiling,
Today Snow White is more beautiful.
She at the mountain hidden,
At the home of the seven dwarfs far away.

On hearing that, the queen infuriated, screaming:

- The Snow White, you must die.

Her into a very tight room in the castle, where nobody is coming footsteps. She poisoned on an apple. Looks very tasty apple, half red and half white, who saw also want to eat, but took a bite of the freshly dead.

After preparation of the apple, her Face, she dressed like a farmer, took the seven mountains to the seven dwarfs. She knocked on the door.

Snow White poked his head through the window, said:

- I do not let anyone in it. Seven dwarves have forbidden it.

She told the other farmers:

- Well, well. I have too many apples. Let me give you a result.

Snow White says:

- No, I'm not allowed to take anything.

The old woman said:

- She was afraid to eat the poison it? Look here, I add the apple in two, she ate half a ripe beautiful red, I eat half white slightly.

The old woman put poison in the apple very well, only half red poison only. Snow White's apple appetite too, find her an apple that does not matter, so she took her share offering. She just took a bite, then fall down dead. She glared at her, laughed, saying:

- White as snow, as red as blood, ebony, this time the best way to save lives dwarfs eyebrow.

When the queen asked to provide:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Moors replied:

- The queen, the most beautiful queen of the country.

At that time, her heart the newly relaxed, relaxation of guys jealous.

The home Dwarfs Snow White was not breathing found lying on the ground. They lifted her up, looking for traces of toxic substances which are not. They loosened her clothes, combed her hair, washed by water and wine for her, but not matter, she really dead already. They placed her on the bed. Chief

seven people sat around the remains uninterrupted three days mourning. They want to bury her, but found her fresh countenance, her cheeks rosy as people live, he said: "Who could we buried her down the black soil." They put her body in a glass coffin, looked remarkable, and her name engraved in letters of gold, clearly all she was a princess. Then they brought the coffin to the mountains, cutting turns guarding. Both species also visited Snow White, first an owl, then crows, finally dove.

Snow White to determine the coffin was long but still fresh countenance as sleep, the skin is still as white as snow, lips red still n

Blood, black hair like ebony.

One day, there was a prince who went to the forest late, went to the dwarfs to sleep. The prince saw a mountain with a coffin in a snowy, in addition to golden words. The prince told the dwarfs:

- The uncle to give us the other coffin, want to get how much we pay.

- The prince has paid us a golden mountain, a silver sea we also do not sell.

The prince said:

- Then the uncertainties. I will love her and take care of her, consider her to be my lover.

Listen to the prince to say that, the good dwarfs are affected and agree. Prince Sai Thi guards the coffin. The carrier encountered the roots of trees, causing snowy people. Snow White vomits the apple with poison.

Instant, she rose again, opened her eyes, raised the coffin, sitting and got up, exclaiming:

- Heaven, where is this?

The prince celebrates said:

- She is here with me.

Then the prince tells Snow White to listen to the story of the story.

Prince continues:

- I love her most. Let's go to my father's palace with me, I will marry her as a wife.

Snow White happily followed the prince's heel. The wedding ceremony is very solemnly celebrated.

The evil girl's aunt of Snow White is also new to the party. The magnificent dress, to the mirror and asked:

Mirror, mirror, on the wall,
Our country is beautiful seems to me one?

Moors replied:

Lord her, grandmother beautiful ceiling,
But Ms. Hoang was more beautiful.

She was a little angry trembling. At the beginning of the head, she didn't go to get married, but she stood still, falsely watching the bride's face.

She came in and recognized immediately Snow White, afraid of being too ranked, she didn't budge, then the cruel heart of her broke, she died.

Mik muốn kết bạn với ma, 

Mk ko tin ma cs thật vậy làm tui tin đi!!!!!

mk nè!!!! kb với mk đi!!

Nhưng mà lần sau đừng đăng câu lung tung nha!!!

DÀN Ý KỂ VỀ NGƯỜI BẠN MỚI QUEN CỦA EM

1. Mở bài

Giới thiệu về người bạn của mình và nêu tình cảm.

2. Thân bài

- Kể hoàn cảnh quen người bạn mới

- Tả ngoại hình bạn mới

- Kỉ niệm đầu tiên của hai bạn

- Tình cảm của mình với bạn

3. Kết bàiTình cảm của mình.

"Đồng bào ta ngày nay cũng rất xứng đáng với tổ tiên ta ngày trước." : nói lên nhận thức đúng đắn, giữ gìn và phát huy những giá trị mà tổ tiên đã để lại của mọi người trong xã hội đương thời.