Cho \(\Delta\) ABC, trên cạnh BC, CA và AB lần lượt lấy các điểm M, N và P sao cho:\(\frac{BM}{MA}=\frac{CN}{CA}=\frac{AP}{AB}=k\left(k>0\right)\)

a) Chứng minh rằng: AM, BN, CP là độ dài ba cạnh của một tam giác mà ta kí hiệu là \(\Delta\left(k\right)\)  

b) Tìm k để diện tích tam giác  \(\Delta\left(k\right)\) nhỏ nhất.

Xác định câu nghi vấn và hình thức nghi vấn trong các đoạn sau:
a. Thấy lão nằn nì mãi, tôi đành nhận vậy. Lúc lão về tôi còn hỏi:
- Có đồng nào, cụ nhặt nhạnh đưa tôi cả thì cụ lấy gì mà ăn ?
(Nam Cao – Lão Hạc)
b. Bỗng bác già nhìn đồng hồ nói một mình:
- Thanh niên bây giờ lạ thật! Các anh chị cứ như con bướm. Mà mới mười một giờ, đã đến giờ “ốp” đâu ? Tại sao anh ta không tiễn mình đến tận xe nhỉ ?
(Nguyễn Thành Long – Lặng lẽ Sa Pa)
c. Cô hỏi luôn, giọng vẫn ngọt:
- Sao lại không vào ? Mợ mày phát tài lắm, có như dạo trước đâu !
(Nguyên Hồng – Những ngày thơ ấu)

VII. Complete the sentences with the verbs in brackets. Use conditional sentences type 1. 1. If the air in a City________ (get) very polluted, it can make people’s eyes burn.

2. If we dump all sorts of Chemicals into rivers, we________ (not be) able to swim in them in the future.

3. Many wildlife habitats will be destroyed if people________ (keep) polluting the environment.

4. If we all use public transport more, we________ (help) reduce air pollution.

5. If we________ (not stop) over-fishing the oceans, many species________ (become) extinct.

6. If everyone________ (recycle) paper, metal and glass, we ________ (not produce) so much rubbish.

7. We________ (have) dirty seafood if we________ (dump) rubbish into the sea.

8. If global warming________ (continue), temperatures________ (rise) even higher.

9. If light pollution________ (keep) growing, you________ (not be) able to see even the Big Dipper at night.

10. We________ (threaten) our own existence if we________ (not cut down) the waste rapidly.

VIII. Complete the sentences with the verbs in brackets. Use conditional sentences type 2.

1. If people________ (not be) so careless, Earth wouldn’t be in danger.

2. The amount of waste ________ (decrease) if people started to buy reusable packages.

3. Many fish wouldn’t die if factories________ (not dump) so many Chemicals into rivers and oceans.

4. If people stopped using cars completely, there________ (be) much less pollution.

5. If people________ (buy) more recycled paper, there wouldn’t be so much waste.

6. If we________ (not bury) Chemical waste underground, we ________ (not pollute) fresh water supplies.

7. Pollution________ (not be) such an issue if governments and common people really ________ (care).

8. What ________ (happen) if the whole world________ (be) full of pollution?

9. If people________ (pay) a little more attention to the environment, the Earth________ (be) greener.

10. If people no longer________ (pollute) the atmosphere, the air________ (soon become) clean again.

ai lam nhanh va dung to se tick

VII. Complete the sentences with the verbs in brackets. Use conditional sentences type 1. 1. If the air in a City________ (get) very polluted, it can make people’s eyes burn.

2. If we dump all sorts of Chemicals into rivers, we________ (not be) able to swim in them in the future.

3. Many wildlife habitats will be destroyed if people________ (keep) polluting the environment.

4. If we all use public transport more, we________ (help) reduce air pollution.

5. If we________ (not stop) over-fishing the oceans, many species________ (become) extinct.

6. If everyone________ (recycle) paper, metal and glass, we ________ (not produce) so much rubbish.

7. We________ (have) dirty seafood if we________ (dump) rubbish into the sea.

8. If global warming________ (continue), temperatures________ (rise) even higher.

9. If light pollution________ (keep) growing, you________ (not be) able to see even the Big Dipper at night.

10. We________ (threaten) our own existence if we________ (not cut down) the waste rapidly.

VIII. Complete the sentences with the verbs in brackets. Use conditional sentences type 2.

1. If people________ (not be) so careless, Earth wouldn’t be in danger.

2. The amount of waste ________ (decrease) if people started to buy reusable packages.

3. Many fish wouldn’t die if factories________ (not dump) so many Chemicals into rivers and oceans.

4. If people stopped using cars completely, there________ (be) much less pollution.

5. If people________ (buy) more recycled paper, there wouldn’t be so much waste.

6. If we________ (not bury) Chemical waste underground, we ________ (not pollute) fresh water supplies.

7. Pollution________ (not be) such an issue if governments and common people really ________ (care).

8. What ________ (happen) if the whole world________ (be) full of pollution?

9. If people________ (pay) a little more attention to the environment, the Earth________ (be) greener.

10. If people no longer________ (pollute) the atmosphere, the air________ (soon become) clean again.

ai lam nhanh va dung to se tick

VII. Complete the sentences with the verbs in brackets. Use conditional sentences type 1. 1. If the air in a City________ (get) very polluted, it can make people’s eyes burn.

2. If we dump all sorts of Chemicals into rivers, we________ (not be) able to swim in them in the future.

3. Many wildlife habitats will be destroyed if people________ (keep) polluting the environment.

4. If we all use public transport more, we________ (help) reduce air pollution.

5. If we________ (not stop) over-fishing the oceans, many species________ (become) extinct.

6. If everyone________ (recycle) paper, metal and glass, we ________ (not produce) so much rubbish.

7. We________ (have) dirty seafood if we________ (dump) rubbish into the sea.

8. If global warming________ (continue), temperatures________ (rise) even higher.

9. If light pollution________ (keep) growing, you________ (not be) able to see even the Big Dipper at night.

10. We________ (threaten) our own existence if we________ (not cut down) the waste rapidly.

VIII. Complete the sentences with the verbs in brackets. Use conditional sentences type 2.

1. If people________ (not be) so careless, Earth wouldn’t be in danger.

2. The amount of waste ________ (decrease) if people started to buy reusable packages.

3. Many fish wouldn’t die if factories________ (not dump) so many Chemicals into rivers and oceans.

4. If people stopped using cars completely, there________ (be) much less pollution.

5. If people________ (buy) more recycled paper, there wouldn’t be so much waste.

6. If we________ (not bury) Chemical waste underground, we ________ (not pollute) fresh water supplies.

7. Pollution________ (not be) such an issue if governments and common people really ________ (care).

8. What ________ (happen) if the whole world________ (be) full of pollution?

9. If people________ (pay) a little more attention to the environment, the Earth________ (be) greener.

10. If people no longer________ (pollute) the atmosphere, the air________ (soon become) clean again.

Ai ma giai dc thi to se tick va ket ban cho nhe

lam nhanh ho to nhe 

cam on moi nguoi

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