Tìm gtln: 

3 - 2x - 2x^2

Tìm gtln của biểu thức sau: 

-2x^2 + 4x - 3 

a/ He ( read ) a book at this time last night.

b/ What you ( do ) at 7 o'clock yesterday?

c/ While they ( play ) video games yesterday, we ( study ) English in the room.

d/ I ( watch ) TV when he ( come ) two days ago.

Use the following words or phrases to complete sentences: 

1. It / important / invest / time / do / leisure activities.

2. They / enjoy / watch / show / last night.

3. Today's world / teenagers / prefer / play / computer games / read / books.

4. Your hobby / can / harm / both / health / social life.

5. You / must / careful / when / make friends / strangers / Internet.

6. Place / where / rice / grow / call / paddy field.

Give the correct form or correct tense of the verbs in brackets:

1. Computers should (use) for a limited time.

2. He seems (be) there. 

3. (Sit) for too long in front of the computer (make) our eyes tired.

4. Linh enjoys (not watch) TV too much every day.

5. I (spend) a lot of time (make) crafts last week.

6. She often (think) of (ban) her son from (use) the computer. 

7. She adores (work) with young children.

8. I prefer (do) yoga rather than (play) computer games.

9. It's not easy (make) a speech on TV.

10. I decide (not communicate) through emails.

11. I am fond of (give) nice presents.

giải thích vì sao điền dạng động từ đó giúp tuoii với

Give the correct form or correct tense of the verbs in brackets:

1. Computers shoul (use) for a limited time.

2. He seems (be) there. 

3. (Sit) for too long in front of the computer (make) our eyes tired.

4. Linh enjoys (not watch) TV too much every day.

5. I (spend) a lot of time (make) crafts last week.

6. She often (think) of (ban) her son from (use) the computer. 

7. She adores (work) with young children.

8. I prefer (do) yoga rather than (play) computer games.

9. It's not easy (make) a speech on TV.

10. I decide (not communicate) through emails.

11. I am fond of (give) nice presents.

Cho tứ giác ABCD có AB=BC và AC là phân giác góc A .

Chứng minh ABCD là hình thang