Yêu cầu bài toán trên khoảng .
Đặt
Vậy ta cần tìm để phương trình vô nghiệm trên .
Phương trình vô nghiệm trên
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Vậy tập hợp các giá trị của tham số thỏa mãn là: Chọn C.
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.
He told her that he admired her paintings and she _______ the compliment by saying that she was a fan of his sculptures.
Everything went according to plan although there were some problems, didn't they?
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.
Fresh evidence has recently come to the light that suggests that the man didn't in fact commit the murder.
I don't think John broke the window because he wasn't here at that time.