Điều kiện xác định: .
Ta có: .
Đặt
Từ (*) suy ra
.
Vậy có tất cả 2 số phức thỏa mãn là và Chọn D.
He told her that he admired her paintings and she _______ the compliment by saying that she was a fan of his sculptures.
Questions 26-30: Each of the following sentences has one error (A, B, C, or D). Find it and blacken your choice on your answer sheet.
If I had knew the time when the football match started, I would have told you.
1.2. TIẾNG ANH
Questions 21-25: Choose a suitable word or phrase (marked A, B, C, or D) to fill in each blank.
We were made _______ a lot of homework to prepare for the upcoming test.
Fresh evidence has recently come to the light that suggests that the man didn't in fact commit the murder.
Cho hàm số liên tục trên , có bảng biến thiên như sau:
Biết
Quay hình phẳng giới hạn bởi đồ thị hàm số , trục tung, trục hoành và đường thẳng quanh trục hoành ta được khối tròn xoay có thể tích là
When the professor and secretary are on a business trip, I will be in charge of that position.
I don't think John broke the window because he wasn't here at that time.