đề bài là gì thế bạn

Công Chúa Giá Băng - đúng 100%

số 1 thích thì tick đúng cho mình nha

LƯU Ý
Các bạn học sinh KHÔNG ĐƯỢC đăng các câu hỏi không liên quan đến Toán, hoặc các bài toán linh tinh gây nhiễu diễn đàn (như 1+1 = ?). Online Math có thể áp dụng các biện pháp như trừ điểm, thậm chí khóa vĩnh viễn tài khoản của bạn nếu vi phạm nội quy nhiều lần.

Chuyên mục Giúp tôi giải toán dành cho những bạn gặp bài toán khó hoặc có bài toán hay muốn chia sẻ. Bởi vậy các bạn học sinh chú ý không nên gửi bài linh tinh, không được có các hành vi nhằm gian lận điểm hỏi đáp như tạo câu hỏi và tự trả lời rồi chọn đúng.r

Đặt d = UCLN(a,b) => a = d.a'

b = d.b'

(a' ; b' nguyên tố cùng nhau)

Ta cần chứng minh : BCNN(a,b). d = a.b hay BCNN(a,b)=\(\dfrac{a.b}{d}\)

Đặt m= \(\dfrac{a.b}{d}\)

m= b.\(\dfrac{a}{d}\)=b.a'

mà a' ; b' nguyên tố cùng nhau nên m thuộc BCNN(a,b) =>BCNN(a,b)=\(\dfrac{a.b}{d}\)

BCNN(a,b) = \(\dfrac{a.b}{UCLN\left(a;b\right)}\)

=> BCNN(a,b). UCLN(a,b) = a.b

47¹⁰² có chữ số tân cùng là 9

51ⁿ có tận cùng là 1

=> 51ⁿ + 47¹⁰² có chữ số tận cùng là 0

=>A chia hết cho 10

STORY OF WATER MELON

Mai An Tiem was an adopted son of 17th King Hung. He was talented and that was why he was highly considered by people and received many favors from the king. Once he said " Present means worry, gift means dept" and that provoked his father's anger. In spite of many pieces of advice from the whole court officials, there was an order that An Tiem and his family had to be deported to an isolated island in the far, far ocean without any belongings.
Fade came to those unlucky people. An Tiem's family was left in the island with nothing but a blunt sword, a clay pot and food that was only enough for them in five days. The wife sunk in sorrows and sobbed while the husband were releasing her and manly declared that they could make everything by their hands.
Life in remove place was so hard that both young and adult in the unfortunate family had to catch fish, oyster and also wild greens to remain life. Later the fruit was out of the season, fish in the sea could not be caught without net, bird was watchful over the trap. What they owned at this time was just some wild greens cultivated by the husband.
One early morning, An Tiem heard the sounds of birds in a distance then he just walked out to see the scene but the birds were frighten and flew high above in confusion and left a small piece of melon with bright red pulp and black tiny seeds. " It was absolutely good for birds. It must be the same for Man" he thought " Why don't I do something with those tiny seeds?" Its fresh and sweet taste seemed to make him believe that his decision was right. With a blunt sword he ploughed a small piece of land and sowed it with the seeds.
Time passed by; the man now was look happy and hopeful when travelling his eyes over the verdant and luxuriant plants sprawling on the sand. All people in the family looked for the coming day that their lianas bear fruit and the fruit got bigger and bigger... One morning the family was woke by the sounds of bird. An Tiem came out into the sand and found one of the melon was half-eaten and showing the bright red color of its pulp. He brought it home then and cut a small piece to each person in the family. The melon taste was so good that everyone liked it but the rest of it was only consumed at noon when they felt that what they had eaten in the morning was unharmful to them.
Thank to this kind of fruit, life in the island now was much better. Melon was cultivated, harvested season by season. Every time An Tiem himself also dropped some fruits with his name curved over their skin into the ocean for the desire of sharing the happiness and looking for a way to the mainland.
Later there were some merchants who got into the island and asked for exchanging tools as well as food for the kind of fruit they had picked up in the sea.
Hung king somewhat felt regretful that he had put his son a death until the day he was offered a melon and broken the news that An Tiem and his family weren't only alive but also cultivated a precious melon in the island. After that a favor was granted to bring An Tiem and his family back to the court as an honor to the country.
From that time on this kind of fruit - Watermelon - was commonly planted but it was said that those melons from Nga Son Island where An Tiem first cultivated it were the best ones.

She prefects dances to sits a place

While my mother washing clothes, I cooking the meal

- If I were a bird, I would be very happy.

(Nếu tôi là một con chim, tôi sẽ rất hạnh phúc.)

- If I had a million USD, I would buy that car.

(Nếu tôi có một triệu đô la, tôi sẽ mua chiếc xe đó.)

- I would be very frightened if somebody pointed a knife at me

(Tôi sẽ rất sợ nếu ai đó chĩa dao vào tôi)

- If I didn't go to their party, they would be offended

(Nếu tôi không tới bữa tiệc của họ, họ sẽ giận)

- If I live near my office I would be in time for work

(nếu tôi ở gần sở làm của tôi tôi sẽ đi làm đúng giờ)

- If I were you I would plant some trees round the house

(Nếu tôi là anh tôi sẽ trồng cây quanh nhà)

- If a burglar came into my room at night I would scream

(Nếu một tên trộm vào phòng tôi vào ban đêm tôi sẽ la lên)

- If this mobile phone were cheaper, I would buy it.

( Nếu chiếc điện thoại này rẻ hơn, tôi sẽ mua nó)

sorry gia tri cua x=2 tong binh phuong cua no la 4 ( chi co 1 gia tri x)