Tìm lỗi sai và sửa:

1. Having rested (A) after a good night’s sleep (B), she jumped out of bed (C), left for work and put all her energies (D) into it.

2. These (A) are among the most popular products is a well-known (B) fact, and we believe that they will continue to do (C) so for some years to come(D).

3. We are due for (A) rain-triggered (B) floods today, so you need to be under guard(C) for them and halt (D) your outdoor work.

4. Though television (A) is the dominant media (B) for United States households, Garrison Keillor’s Saturday night radio show (C) of folk songs and stories is heard (D) by millions of people.

5. There is (A) a panel, to discuss about (B) drug addiction, in progress (C) in the student lounge (D).

6. After the eruption shortly (A), the residents of the ranch, located (B) close to the volcano, placed (C) a call seeking evacuation (D).

7. Only recently did the talent spotter wake (A) up to the fact that my daughter, an aspiring (B) starlet with great potentials (C), would make it to the top (D).

8. In the face (A) of a weakening (B) economy and fuel crises, many people might well (C) miss out on summer vacations (D).

9. In order for (A) our targets to set and meet (B), we require (C) that the youth be at the forefront (D) of the fight against AIDS.

10. Though honored (A) for her commitment for her profession (B), she is most proud (C) of her roles as (D) a wife and mother.

Tìm lỗi sai và sửa:

1. Having rested (A) after a good night’s sleep (B), she jumped out of bed (C), left for work and put all her energies (D) into it.

2. These (A) are among the most popular products is a well-known (B) fact, and we believe that they will continue to do (C) so for some years to come(D).

3. We are due for (A) rain-triggered (B) floods today, so you need to be under guard(C) for them and halt (D) your outdoor work.

4. Though television (A) is the dominant media (B) for United States households, Garrison Keillor’s Saturday night radio show (C) of folk songs and stories is heard (D) by millions of people.

5. There is (A) a panel, to discuss about (B) drug addiction, in progress (C) in the student lounge (D).

6. After the eruption shortly (A), the residents of the ranch, located (B) close to the volcano, placed (C) a call seeking evacuation (D).

7. Only recently did the talent spotter wake (A) up to the fact that my daughter, an aspiring (B) starlet with great potentials (C), would make it to the top (D).

8. In the face (A) of a weakening (B) economy and fuel crises, many people might well (C) miss out on summer vacations (D).

9. In order for (A) our targets to set and meet (B), we require (C) that the youth be at the forefront (D) of the fight against AIDS.

10. Though honored (A) for her commitment for her profession (B), she is most proud (C) of her roles as (D) a wife and mother.

Cho đường tròn (O) và điểm A nằm ngoài đường tròn , kẻ 2 tiếp tuyến AM, AN. Qua A vẽ cát tuyến ABC (B nằm giữa A và C)

a) CM: A, M, O, N nằm trên 1 đường tròn

b) cm: AN^2= AB.AC

c) Tính BC biết AB=4, AN=6

d) gọi I là trung điểm BC, đường thẳng NI cắt đường tròn tại K. Cm: MK song song AC

Giải hệ PT:

\(\left\{{}\begin{matrix}x\sqrt{5}-\left(1+\sqrt{3}\right)y=1\\\left(1-\sqrt{3}\right)x+y\sqrt{5}=1\end{matrix}\right.\)

Giải hệ PT:

\(\left\{{}\begin{matrix}x\sqrt{5}-\left(1+\sqrt{3}\right)y=1\\\left(1-\sqrt{3}\right)x+y\sqrt{5}=1\end{matrix}\right.\)

Giải hệ PT:

\(\left\{{}\begin{matrix}\dfrac{2x}{x+1}+\dfrac{y}{y+1}=\sqrt{2}\\\dfrac{x}{x+1}+\dfrac{3y}{y+1}=-1\end{matrix}\right.\)

Giải hệ PT

\(\left\{{}\begin{matrix}x\sqrt{5}-\left(1+\sqrt{3}\right)y=1\\\left(1-\sqrt{3}\right)x+y\sqrt{5}=1\end{matrix}\right.\)

Tìm x,y

\(\dfrac{x}{y+45}=\dfrac{y}{x+30}=\dfrac{2}{3}\)