- Các biện pháp để phòng tránh tai nạn về điện:

+ Lựa chọn và sử dụng những thiết bị điện an toàn. Các loại như ổ cắm điện, thiết bị điện dụng… nên lựa chọn những sản phẩm chất lượng tốt, phù hợp với dòng điện của gia đình. 

+ Thường xuyên kiểm tra các thiết bị, dây dẫn điện.

+ Đảm bảo chắc chắn là nguồn điện đã ngắt hoàn toàn trước khi lắp đặt sửa chữa điện dân dụng, điện lưới.

+ Tuân thủ tuyệt đối an toàn hành lang lưới điện. Giữ khoảng cách an toàn với đường dây điện cao áp và các trạm biến thế.

+ Không sử dụng dây điện trần làm đường dây dẫn điện.

+ Tìm hiểu những kiến thức về an toàn điện và cách xử lý khi xảy ra tai nạn điện giật.

+ Khi tay ướt không nên chạm tay vào các thiết bị điện.

TL: Không dùng dây nối bị hư hỏng

Không dùng thiết bị điện lỗi

Tắt đèn trước khi thay bóng mới

HT

$A=a^2\sin {90}^{\circ }+b^2\cos {90}^{\circ }+c^2\cos {180}^{\circ }$

$=a^2\mathrm{*1}+b^2*$ 0 $+c^2\mathrm{*\; (-1}$

$=a^2$ $-c^2$

$B=3-{\sin }^2{90}^{\circ }+2{\cos }^2{60}^{\circ }-3{\tan }^2{45}^{\circ }$.

= 3 - 1 + 1/2 - 3 = -1/2

What did you see at the zoo?

 I saw crocodiles.

Can I have a question?

What experiences about?

2: Whers

Kẻ \(MI⊥AB,MJ⊥AC\)

Ta thấy \(\widehat{EAK}=\widehat{AMI}\) (Cùng phụ với \(\widehat{KAM}\))

Vậy nên \(\Delta EAK\sim\Delta AMI\left(g-g\right)\Rightarrow\frac{EA}{AM}=\frac{AK}{MI}=2.\frac{AK}{KC}\)

Tương tự : \(\Delta DAH\sim\Delta AMJ\left(g-g\right)\Rightarrow\frac{DA}{AM}=\frac{AH}{MJ}=2.\frac{AH}{BH}\)

Mà \(\Delta AHB\sim\Delta AKC\left(g-g\right)\Rightarrow\frac{AH}{AK}=\frac{HB}{KC}\Rightarrow\frac{AH}{HB}=\frac{AK}{KC}\)

Vậy thì \(\frac{AE}{AM}=\frac{DE}{AM}\Rightarrow AE=ED.\)

Tam giác DEM có MA là đường cao đồng thời là trung tuyến nên nó là tam giác cân tại M.

bằng tiếng anh hết à!!

mk nghĩ là nếu nhún thì sẽ có đà nhảy lên nhưng mà k nhún vẫn có thể nhảy lên mà =)) haha

ht

ht

ht

ht

ht

TL:

Nếu không nhún chân khi nhảy lên thì sẽ không có lực để có thể nhảy lên

Mik ko chắc nha

@@@@@@

HT

- \(m=0\)dễ thấy không thỏa mãn. 

- \(m\ne0\): 

\(\Delta'=\left(m-1\right)^2-3\left(m-2\right).m=-2m^2+4m+1\)

Để phương trình đã cho có hai nghiệm \(x_1,x_2\)thì \(\Delta'\ge0\Rightarrow-2m^2+4m+1\ge0\).

Khi phương trình có hai nghiệm \(x_1,x_2\), theo Viete ta có:

\(\hept{\begin{cases}x_1+x_2=\frac{2\left(m-1\right)}{m}\\x_1x_2=\frac{3\left(m-2\right)}{m}\end{cases}}\)

Ta có: \(x_1+2x_2=1\)

\(\Rightarrow\left(x_1+2x_2-1\right)\left(x_2+2x_1-1\right)=0\)

\(\Leftrightarrow5x_1x_2+2\left(x_1^2+x_2^2\right)-3\left(x_1+x_2\right)+1=0\)

\(\Leftrightarrow2\left(x_1+x_2\right)^2-3\left(x_1+x_2\right)+x_1x_2+1=0\)

\(\Rightarrow2\left[\frac{2\left(m-1\right)}{m}\right]^2-\frac{6\left(m-1\right)}{m}+\frac{3\left(m-2\right)}{m}+1=0\)

\(\Leftrightarrow8\left(m-1\right)^2-6m\left(m-1\right)+3m\left(m-2\right)+m^2=0\)

\(\Leftrightarrow6m^2-16m+8=0\Leftrightarrow\orbr{\begin{cases}m=2\\m=\frac{2}{3}\end{cases}}\)

Thử lại đều thỏa mãn. 

hok bé ơi

Trang An scenic complex in Ninh Binh province is located on the southern edge of the Red River Delta, in the North of the Socialist Republic of Vietnam, about 90km southeast of Hanoi. The heritage has an area of ​​6,226 hectares, the buffer zone has an area of ​​6,026 hectares, mostly wetlands and rice fields.``

On June 25, 2014, in Doha (Qatar) capital, the World Heritage Committee of the United Nations Educational, Scientific and Cultural Organization (UNESCO) officially registered the Trang An Scenic Landscape Complex - Ninh Binh province on the list of World Cultural and Natural Heritage - the first mixed heritage of Vietnam and Southeast Asia. The outstanding global value of Trang An Scenic Landscape Complex is recognized by the World Heritage Committee based on three criteria: Culture (Criterion v), aesthe beauty (Criterion vii), and geology. fake

* Cultural values ​​(Criterion v):

Trang An is the most prominent site in Southeast Asia and holds global significance in demonstrating how humans interact with the natural landscape and adapt to the enormous changes in the environment during the period. over 30,000 years. The long cultural history here is closely associated with the geological development of the Trang An limestone massif in the late Canh Tan and Toan Tan periods. This was a period when local residents experienced some of the most extreme clima and environmental fluctuations in earth's history, including the constant flooding of the landscape with water due to sea level fluctuations. In such a compact landscape, there are many sites with different stages and functions, including a unique system of prehistoric human habitation.

*Aesthe value (Criterion v):

Trang An's karst tower landscape is among the most beautiful and fascinating of its kind in the world. Dominating the landscape is a series of 200m high stone towers covered by forests linked together in many places through sharp ridges, embracing deep flooded valleys connected through countless underground caves. Mixed with the forests are rice fields stretching along rivers, with farmers and fishermen living in their traditional way. Visitors traveling on traditional boats steered by local guides can experience the natural environment, feeling comfortable, safe and peaceful. The majes mountains, mysterious caves and sacred temples, pagodas, shrines and palaces in Trang An have inspired people for generations. This is where culture meets the magic, mystery and splendor of the natural world, and where culture is transformed by it.

* Values ​​of geology and geomorphology (Criterion v):

Trang An is a wonderful geological heritage that shows more clearly than other places in the world the final stages of karst evolution in a humid tropical environment. This is an excellent and outstanding model on a global scale. The deep cleavage of an uplifted limestone block over a period of more than 5 million years has created a series of classical landscapes, including towers, cones, closed depressions (or sinkholes), valleys, and valleys. inward drainage valleys (or basins), base caves and underground passages through caves with sediments in them. Of great significance is the presence of transitional forms between the “fengcong” karsts with ridges connecting the towers, and the “fenglin” karst where the towers stand discretely on the alluvial plain. Canh Tan and Toan Tan, the landscape has been completely changed due to many times of sea advance and retreat. marine sediments and shellfish layers.

* Management of the heritage area: Most of the area of ​​the heritage is located in 03 protected areas according to the regulations of the national conservation areas, including: Hoa Lu Ancient Capital Historical and Cultural relic, Trang An - Tam Coc - Bich Dong scenic area, Hoa Lu endemic primeval forest. Management Board of Trang An Scenic Landscape Complex - An agency under the Department of Tourism responsible for heritage management. The Management Board has the capacity and resources to protect and manage the site according to the standards of a World Heritage site. The Management Board represents all stakeholders and maintains relationships with ministries, sectors, research institutes, commercial organizations, representatives of local communities and the general public. Heritage management is conducted according to the management plan, approved by the government and provincial authorities, with input from the local community and stakeholders in the Heritage site.

Trang An Scenic Landscape Complex, recognized as a World Heritage Site, is famous for its cultural value, natural beauty, geological value, and preservation of heritage. The most outstanding feature of this site is its cultural value. Trang An is a prominent place in Southeast Asia and the world that contains abundant archaeological evidence including discovered signs of human activity dating back almost 30,000 years. The natural beauty of the place is another attractive characteristic. Trang An - Tam Coc - Bich Dong not only has a natural scenic landscape but also is an ecological site. With a spectacular landscape of limestone peaks permeated with valleys, some of which are submerged, and surrounded by steep, almost vertical cliffs, Trang An Eco-tourist Site is considered an outdoor geological museum. With such a long-lasting history, Trang An Scenic Landscape Complex is also home to more than 800 species of flora and fauna. Having met UNESCO criteria for outstanding universal value to humanity, Trang An Scenic Landscape Complex was added to the World Heritage Site List in 2014 as a mixed natural and cultural property.

Dàn ý:

- Writer address/ reader address thì tự viết

- Greeting: Dear principal ......

- Who you are: I am an student from class ..... name .... (....) I write to you because I am so disappointed about food in cafeteria....

- Problems: the food is not good, too many fat, less vegetable,...

- Solutions: more choices, more vegetables...

- Do smth: I really believe in your power and I know you can do (change food, more menus, ....)

- Finish: I know you can do it. Signature, ......

Đây là dạng bài Ngữ Văn + Anh nên ko có kết quả cụ thể nên bạn có thể xem văn mẫu và dàn ý nhé!