Xét tam giác ABC có:

M là trung điểm của AB, N là trung điểm của AC => MN là đường trung bình của tam giác ABC

=> MN//BC và MN=1/2 BC

( Định lý 2 sgk 8 / 77: Đường trung bình của tam giác thì // với cạnh thứ 3 và bằng nửa cạnh ấy)

4ph6jV9.png (1366×768) ( kí hiệu bằng nhau hộ mk )

Xét tam giacs ABC

 Vì N là trung điểm AC

M là trung điểm AB

=)) MN là đường trung bình tam giác ABC 

Vậy MN // BC và MN = 1/2 BC ( đpcm )

1 The science book are....on ..the left

2. There are a lot of books,newspapers, magazines,etc.......in.........the library

3. Magazines and newspapers are ....on....the racks.....in......the middle.

4. Are there any English books.........on..the shlves next...to..the study area?

5. You find the physics books....on.....the back of the library

6. The United States' Library of Congress is ..........in...Washington DC.7

Those books are.......in...........English

8. Washington DC is the capital.......of...the USA

1 Hoàn tất câu với từ cho sẵn trong khung.

1 I keep an English........dictionary......beside me when I'm reading an English book.

2. Charles Dicken is my favorite....author............

3. People use the..........index......to ffind a book in the library.

4.Magazines and newpapers are on the ........racks........in the middle

5. What's the .........title...of that book? - ''Oliver Twist''

6. She works in a library. She is a ......librarian........

7. You can borrow books from the.....library..........

8. Vietnamese students have to wear school. uniform

Young Talent isn't as old as Nightingale.

I think painting is very boring.

Viết lại câu sau mà nghĩa không đổi

I last wrote to  him five years ago (for)

=> I have.................. not written to him for five years..............

The market dose not have any carrots

=> There............. are no carrots in the market dose.................

Viết lại câu sau mà nghĩa ko đổi

I last wrote to  him five years ago (for)

=> I haven't written to him for five years .

The market dose not have any carrots

=> There aren't carrot in the market

bắt đầu v3

bắt đầu v3

Học tốt!

nhanh nhé

My school has also launched to support people in the Central region who are suffering so much from natural disasters. I watched TV and saw many houses, schools, hospitals flooded in the sea, the students of the same age had to quit school. Schools, classrooms were badly damaged, all books, clothes and property were swept away by the floodwaters ... Without everyone's help and support, I worry they could not continue. can go to school anymore. Therefore, I spent the money that my grandparents and parents allowed me to buy books to support. I also composed some unused books and clothes to send to students in flood areas. Hopefully, these items will help them keep going back to school. I also hope everyone will donate cash to help rebuild the school and repair the classrooms so that the teachers and students there can return to the school soon.

Whether donating money or clothes, old books, boxes of noodles ..., I see these are very pracal material things for students who are suffering from natural disasters. However, the most important thing is that you must be really serious and have the spirit of helping people in times of difficulty. Many artists and brothers and sisters also called for donations of money, going to the flooded areas to send gifts and materials to everyone. Her parents at the agency also contributed a day's salary to buy books, noodles, and food. However, many of you consider the support and donation a type of "movement is done". Clothes that are too old, torn and unusable, can also be donated ... Sadly, there are still you indifferent and do not want to paripate.

From thousands of generations now, Vietnamese people have always had the spirit of "good leaves protect torn ones". Facing the difficult situation of the people of Central Vietnam, after experiencing floods, many schools and agencies joined hands to contribute money and material. This is an act of gesture to the people in areas hit by natural disasters to share some of the loss and pain.

To respond to the child's contribution movement at the school, parents should join their children to contribute by pracal actions to help the people in the affected areas, including teachers and students to help soon. recover the consequences, stabilize life as well as teaching and learning. For example, making a collection of unused furniture with your child, books and old clothes to donate to school ... Teaching children to share, helping others will also contribute to giving children a good virtue, from that forms a beautiful personality.