có mình

ôi chán thế tui lớp 7

tui nhaHT

tui nek

Câu 1: 

1: \(\overrightarrow{OM}=\dfrac{\overrightarrow{OA}+\overrightarrow{OD}}{2}=\dfrac{\overrightarrow{BO}+\overrightarrow{OA}}{2}=\dfrac{\overrightarrow{BA}}{2}=-\dfrac{1}{2}\overrightarrow{AB}\)

\(\Leftrightarrow x=-\dfrac{1}{2}\)

\(\overrightarrow{BD}=2\cdot\overrightarrow{BO}=-2\cdot\overrightarrow{OB}\)

nên y=-2

2: \(2\cdot\overrightarrow{ON}=\overrightarrow{OB}+\overrightarrow{OC}=\overrightarrow{DO}+\overrightarrow{OC}=\overrightarrow{DC}=\overrightarrow{AB}\)

Vậy: Các vecto u thỏa mãn là vecto DC và vecto AB

A C C B C A B A A B 

Are running

Flies

A - C - C - B - C - A - B - A - A - B

are running - flies

không có câu hỏi sao trả lời

III

1 were killed

2 would be

3 won't sent

5 to leave

6 didn't want

IV

1 A

2 C

3 B

4 C

5 B

Giải thích giúp mik với 

😭😭😭

ko ai quên đc đâu

1C 2A 3D 4B

What about helping me with my HW?

I haven't met her for 3 days

Have you ever read that book yet?

The USA had colour TV in 1953

The Eiffel Tower is the most famous building in Paris

Ngoc has never been to HCM city before

1D 2D 3B 4C

Bài 5: 1.C

2.A

3.D

4.B

Bài 6: 1.What about helping me with my homework?

2. I haven't met her for three days

Bài 7: 1. Have you ever read that book yet?

2. The USA had colour TV in 1953

3. The Eiffel Tower is the most famous building in Paris

4.Ngoc has never been to Ho Chi Minh City before

Bài 8: 1.D

2.D

3.B

4.C

b: Ta có: \(47\dfrac{1}{9}:\left(-\dfrac{5}{2}\right)-27\dfrac{1}{9}:\left(-\dfrac{5}{2}\right)\)

\(=\left(47+\dfrac{1}{9}\right)\cdot\dfrac{-2}{5}-\left(27+\dfrac{1}{9}\right)\cdot\dfrac{-2}{5}\)

\(=20\cdot\dfrac{-2}{5}\)

=-8