p=2=>p^2+11=15(là hợp số) (loại)

p=3=>p^2+11=20(loại)

p=5=>p^2+11=36(loại)

Nói chubng là em ko hiểu đề bài ạ

Tìm tất cả số nguyên tố p sao cho số p2 + 11 có chính xác sáu ước số khác nhau (bao gồm 1 và số chính)

Đề đây

Tìm tất cả số nguyên tố p sao cho số p² + 11 có chính xác sáu ước số khác nhau (bao gồm 1 và số chính)

* Hình ảnh minh họa 

Các cây có hạt kín là

Bưởi, Đậu, Lúa , Mướp, Ổi,.....

Hok tốt

Những loài cây có hạt kín là:

Hạt trần - cây thông

Lúa, ngô, kê, lúa mì

Các loại cải, su hào, bầu bí, mướp, su su

Cây hoa cúc, hoa lan 

Cây cọ, dùa, mây song,...

                                                                     ~~Học tốt~~

Chất lượng hạt là một trong các điều kiện cần cho hạt nảy mầm. + Hạt có chất lượng tốt sẽ có khả năng nảy mầm cao hơn. + Việc bảo quản tốt sẽ giúp hạt giữ được chất lượng. - Nhu vậy, cần phải bảo quản hạt giống tốt vì hạt giống có chất lượng tốt, khả năng nảy mầm cao hơn.

cứu tuiii

Chất lượng hạt là một trong các điều kiện cần cho hạt nảy mầm. + Hạt có chất lượng tốt sẽ có khả năng nảy mầm cao hơn. + Việc bảo quản tốt sẽ giúp hạt giữ được chất lượng. - Nhu vậy, cần phải bảo quản hạt giống tốt vì hạt giống có chất lượng tốt, khả năng nảy mầm cao hơn.

\(2345-1000:\left[19-2.\left(21-18\right)^2\right]\)

\(=2345-1000:\left[19-2.3^2\right]\)

\(=2345-1000:\left[19-2.9\right]\)

\(=2345-1000:\left[19-18\right]\)

\(=2345-1000:1\)

\(=2345-1000\)

\(=1345\)

2345 - 1000 : {19-2.(21-18 )²  }

=2345 - 1000 : {19-2.9}

=2345 - 1000 : {19 - (2 .9)}

=2345 - 1000

=1345

Không  biết mình làm đúng không vì mình làm toán hơi dở.   ^_^

2345- 1000:[ 19-2.(21-18)^2]

= 2345- 1000:[ 19-2. 3^2]

= 2345- 1000:[ 19- 2.9]

= 2345-1000:[ 19-18]

= 2345- 1000:1

= 2345-1000

= 1345

Answer 

1) Ha Long Bay

Last week, at a painting exhibition, I was shown a picture of Ha Long Bay. Halong Bay is a famous natural sights of Vietnam, the Gulf core is recognized by UNESCO as World Natural Heritage. Highlighted in the picture are the rocky mountains with different sizes rise on the jade blue sea. At the right corner of the picture is a white sailing boat traveling through the rocky mountains. Up above are the white seagulls hovering along with the clouds floating on the blue sky. For me, this is a very beautiful landscape. I love this painting.

Cre : http://hocvan.edu.vn/doan-van-ta-buc-tranh-vinh-ha-long-lop-3-11-773.html + Translate

2) Da Nang City

My hometown is Da Nang where is the capital of Viet Nam. Now, I am living with my parent there. Da Nang is the most special city with many famous places as Ban Dao Son Tra, Bien My Khe, Quang Nam …In addition, people here is very kind and friendly

 Cre : http://tienganhonline24h.com/mau-viet-doan-van-ve-que-huong-bang-tieng-anh-don-gian/

1,Ha Long

Nowadays, Viet Nam is known as not only a potential country with flourishing market economy but also a popular travel destination with heart-touching magnificent landscapes. Recognised as one of seven new world heritage sites by UNESCO, charming scenes of Ha Long Bay seems to appeal to a large number of local and foreign tourists.
Ha Long Bay, a stunningly scenic spot is located in Quang Ninh province in the northeast of Vietnam. The bay covers an area of over 1500 sq km, includes over 1600 islands and islets which form a spectacular seascape of limestone. This is an unique heritage as it marks important events in the formation and development of Viet Nam history; simultaneously, it is also blessed by mother nature with breathtaking views. In addition,your trip to Ha Long Bay will not be complete and perfect if you miss Bo Hon island- the home of variety of flora and fauna, Yen Tu mountain, Surprise Cave or Kissing rocks. Futhermore, it enjoys warm and tropical climate which is suitable for tourists to visit at any time. Come to Ha Long, besides immersing yourselves in her natural beauty, tourists can have an opportunity to savour delicious seafood with reasonable price and best service as well as relax with water sports such as swimming, scuba-diving, water- skiing… Moreover, residents here are very amiable, hospitable and ready to help anyone if you are in a fix. 
To put it briefly, a mysal, dreamy and elegant Ha Long Bay has become the pride of Vietnamese people and it is everyone’s awareness and responsibility to conserve and preserve this precious heritage.

2,Da Nang

There are several heritage and splendid sights in Vietnam. Especially, Da Nang is one of the most popular place for both Vietnamese and foreign tourist. Da Nang includes sea, Son Tra island, mountain and beautiful landscape. There are a lot of interesting places such as: Asia entertainment park, Ba Na hill, Hoi An ancient town, My Khe beach, museum of art as well as famous bridges. The city is well known for its fresh atmosphere, friendly people and security. The weather is glorious all the year and it brings this city many delicacies from sea and perfect living condition for people, specifically the elder. Visiting Da Nang, I am really impressed by Ba Na hill containing longest cable car from land to the top of the mountain. It is an unforgettable experience for visitors to observe breathtaking sight and picturesque scene. Beside, the beaches have long golden sand, deep blue sea in addition huge bunches of fresh coconut. Tourist has a chance to relax, enjoy the peace and nature, play aqua sport. Moreover, the city has many big bridges : Dragon bridge, Quay bridge and a large outdoor entertainment named Asia park. Additionally, there are a lot of delicious typical dishes such as: Quang noodle, xeo cake, pork pan-cake and others. Da Nang is preserved for its natural beauty; therefore, there is an increasing number of tourists come here. Consequently, it leads to polluted environment, natural damage and other social problem. However, the security of the city is good that there is no street robbery. Hence, Da Nang is voted to be one of the most worth-living cities in Vietnam. In the future, I hope Da Nang will develop and become more popular over the world.

đúng thì tích mk nha

Last week, at a painting exhibition, I was shown a picture of Ha Long Bay. Halong Bay is a famous natural sights of Vietnam, the Gulf core is recognized by UNESCO as World Natural Heritage. Highlighted in the picture are the rocky mountains with different sizes rise on the jade blue sea. At the right corner of the picture is a white sailing boat traveling through the rocky mountains. Up above are the white seagulls hovering along with the clouds floating on the blue sky. For me, this is a very beautiful landscape. I love this painting.

WHAT SUBJECTS DO ENGLISH CHILDREN LEARN AT SCHOOL?

All English children aged from 5 - 16 are taught the National Curriculum. All children must have a broad and balanced education up to the age of 16. According to the National Curriculum, children must study many subjects: English, Computers, History... .In the English class, they learn speaking, listening, reading and writing. In Computers they learn about Information and communication technology. In History, they study local history, the Romans, Anglo-Saxons and Vikings in Britain, Britain and the wider world in Tudor times, Ancient Greeks and one of past societies. 

They study many  other  things  as  well,  such  as   Mathematics, Religious Education, Science, Design and technology, Music, Art, Physical education. They have to study a modern foreign language such as French or German. English children enjoy their classes.
34. What are all English children aged from 5 - 16 taught?
--> All English children aged from 5 - 16 are taught the National Curriculum.
35. What must all children have up to the age of 16?
--> All children must have a broad and balanced education up to the age of 16.
36. What do English students learn in the English class?
--> In the English class, they learn speaking, listening, reading, and writing.
37. What modern language do English students have to study at school?
--> They have to study French or German at school.
38. Do English children like their classes? 
--> Yes. they do.

34 All English children aged from 5 - 16 are taught the National Curriculum
35  All children must have a broad and balanced education up to the age of 16.
36In the English class, they learn speaking, listening, reading and writing
37 They have to study a modernforeign language such as French or German
38 English children enjoy their classes
Chúc Bạn Học Tốt ^^
 

Bài làm

\(S_1=\frac{15}{1.3}+\frac{15}{3.5}+\frac{15}{5.7}+...+\frac{15}{2017.2019}\)

\(S_1=15.\frac{1}{1.3}+15.\frac{1}{3.5}+15.\frac{1}{5.7}+...+15.\frac{1}{2017.2019}\)

\(S_1=15.\left(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{2017.2019}\right)\)

\(S_1=15.\left(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{2017}-\frac{1}{2019}\right)\)

\(S_1=15.\left(1-\frac{1}{2019}\right)\)

\(S_1=15.\left(\frac{2019}{2019}-\frac{1}{2019}\right)\)

\(S_1=15.\frac{2018}{2019}\)

\(S_1=\frac{2018}{673}\)

# Chúc bạn học tốt #

Bài làm

Chắc zậy, không chắc nữa.

~ Sai thì thôi nha ~
# Học tốt #

\(S1=\frac{15}{1.3}+\frac{15}{3.5}+\frac{15}{5.7}+...+\frac{15}{2017.2019}\)

\(S1=\frac{15}{2}.\left(\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+...+\frac{2}{2017.2019}\right)\)

\(S1=\frac{15}{2}.\left(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{2017}-\frac{1}{2019}\right)\)

\(S1=\frac{15}{2}.\left(1-\frac{1}{2019}\right)\)

\(S1=\frac{15}{2}.\frac{2018}{2019}\)

\(S1=\frac{5045}{673}\)