Cho tam giác ABC (AB<AC). AD là phân giác trong của góc A. Qua trung điểm E của cạnh BC, vẽ đường thẳng song song với AD, cắt cạnh AC tại F, cắt đường thẳng AB tại G. Chứng minh CF=BG.

cho hình bình hành ABCD . Trên cạnh AB lấy một điểm M và trên cạnh CD lấy một điểm N sao cho DN=BM. Chứng minh rằng 3 đoạn thằng AC,BD,MN đồng qui.

Fill in the blanks with suitable prepositions.

1. My mom divided the cake ........ the children.

2. This country consists ...... two regions.

3. The canoe turned over and everyone fell ........ the deep water.

Fill in the blanks with suitable prepositions.

1. She went out the room ........... saying a word.

2. The life in the countryside is changing ....... better.

3. She was born ........ 2 o'clock ..... 18th July.

4. Mary is thinking ...... importing flowers ..... China.

5. They are traveling .......... the airport ..... a bus.

Finish the second sentence in such a way that it means exactly the same as the first one.

1. " Don't cry my child " said the mother.

-> The mother asked ..............

2. May I turn on the televison? (mind)

-> Do you ................

3. Would you mind not using the office phone? (use)

-> I'd ...........

4. " Don't throw things away" - Mrs. Thanh said to the students. (asked )

-> Mrs. Thanh ..............................

Finish the second sentence in such a way that it means exactly the same as the first one.

1. They will rebuild the building next year.

-> The buiding ...........................

2. That's the strangest film I've ever seen.

-> I have never ..................

3. Mai said : " It is raining heavily outside. "

-> Mai said ..........

4. France presented the statue of liberty to the United States in 1876.

-> The Sratue ..........

5. Peole should stop experiments on animals.

->Experiments ..........

Em hiểu Điều 199. Tội sử dụng trái phép chất ma túy ( Bộ luật Hình sự 1999) như thế nào?

giải phương trình

\(\left(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+....+\dfrac{1}{13.15}\right)\left(x-1\right)=\dfrac{3}{5}x-\dfrac{7}{15}\)

giải phương trình:

\(\dfrac{x-5}{1990}+\dfrac{x-15}{1980}+\dfrac{x-25}{1970}=\dfrac{x-1990}{5}+\dfrac{x-1980}{15}+\dfrac{x-1970}{25}\)

giải phương trình:

12 - 2(x-1) = x(x-2)²-5x²