"Where is my umbrella?" she asked.
She asked me where her umbrella was.

"How are you?" Martin asked us.
Martin asked us how we were.

He asked, "Do I have to do it?"
He asked me if he had to do it.

"Which dress do you like best?" she asked her boyfriend.

She asked her boyfriend which dress he liked best.

(Sao lại she asked her boyfriend lại hỏi thích váy nào ?)

"What are they doing?" she asked.
She wanted to know what they were doing.

"Are you going to the cinema?" he asked me.
He wanted to know if I was going to the cinema.

The teacher asked, "Who speaks English?"
The teacher wanted to know who spoke English.

"How do you know that?" she asked me.
She asked me how I knew that.

"Has Caron talked to Kevin?" my friend asked me.
My friend asked me if Caron had talked to Kevin.

Cho  Δ A B C có 4 đường thẳng song song với BC, 5 đường thẳng song song với AC, 6 đường thẳng song song với AB. Hỏi 15 đường thẳng đó tạo thành bao nhiêu hình thang (không kể hình bình hành).

A. 360        

B. 2700       

C. 720         

D. Kết quả khác

Điều kiện cần và đủ để z là một số thực là:

A.  z = z ¯ .

B.  z = z .

C.  z = − z ¯ .

D.  z = − z .

Dãy số nào sau đây giảm?

A.  u n = n − 5 4 n + 1 n ∈ ℕ ∗ .

B.  u n = 5 − 3 n 2 n + 3 n ∈ ℕ ∗ .

C.  u n = 2 n 3 + 3 n ∈ ℕ ∗ .

D.  u n = cos 2 n + 1 n ∈ ℕ ∗ .

Diện tích hình phẳng giới hạn bởi đồ thị hàm số  y = x + 1 x − 2  và các trục tọa độ là:

A.  3 ln 3 2 − 1.

B.  5 ln 3 2 − 1.

C.  3 ln 5 2 − 1.

D.  2 ln 3 2 − 1.

Nếu  ∫ 1 2 f x d x = 3 , ∫ 2 5 f x d x = − 1  thì  ∫ 1 5 f x d x  bằng:

A. -2

B. 2

C. 3

D. 4