Cho \(M=99...98\) (với n chữ số 9)

Tính \(M^2\)

Tìm \(x;y\)

\(4x^2+4y^2-12x-20y+34=0\)

Gợi ý: Dùng \(A^2+B^2=0\)

Chứng tỏ biểu thức B luôn dương biết

\(B=x^2-xy+y^2\) với \(x;y\) không đồng thời bằng 0

Choose the best option

1. You'll have to ... your holiday if you're to ill to travel.

A. put off B. put out C. put down D. put up

2. Remember to ... your shoes when you're in a Japanese house.

A. take care B. take on C. take over D. take off

3. ... I'd like to help you out, I afraid I just haven't got any spare money at the moment.

A. Much as B. Try as C. However D. Despite

Circle the correct sentence that is made from the words given

people / competitive / more likely / suffer / effects / stress / health.

A. People are competitive and more likely suffering by the effects of stress for their health.

B. People, competitive and more likely, suffer from the effects of stress on their health.

C. People are competitive and more likely to be suffered from the effects of stress for their health.

D. People who are competitive are more likely to suffer from the effects of stress for their health.

Rewrite the sentences using the word given that has the same meaning as the original one.

As soon as we had finished dinner, the thunderstorm broke.

➝ Hardly ................

Rewrite the sentences using the word cue in bracket (don't change the word in anyway)

1. She locked the door so that nobody would disturb her. (avoid)

2. Long found it difficult to live in a big city. (difficulty)

3. Mary succceeded in finishing all her work on time. (managed)

4. The bus couldn't run because of the fog. (prevented)

5. We couldn't contact him because we lost his phone number. (if)