Tổng Tất Cả Các Nghiệm Của Phương Trình Trên đoạn Là - Cungthi.online

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Câu hỏi

Tổng tất cả các nghiệm của phương trình trên đoạn là         

A.

 

B.

 

C.

 

D.

 

Đáp án và lời giải Đáp án:D Lời giải:

Chọn D    Ta có:  ( với , ). Mà  nên . Vậy tổng các nghiệm thỏa mãn đề bài là .  

 

Đáp án đúng là  D

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