Cho phương trình log4x+12+2=log24−x+log84+x3. Tổng tất cả các nghiệm của phương trình là – 2023 Post author:admin Post published:18/04/2023 Post category:Uncategorized Post comments:0 Comments Câu hỏi: Phương trình log33x−1.log33x+1−3=6 có A. hai nghiệm dương Đáp án chính xác B. một nghiệm dương B. một nghiệm dương D. một nghiệm kép Trả lời: Ta có: log33x−1.log33x+1−3=6⇔log33x−1.log33.3x−3=6⇔log33x−1.log33.3x−1=6⇔log33x−1.1+log33x−1=6⇔log33x−12+log33x−1−6=0⇔log33x−1=2log33x−1=−3⇔3x−1=93x−1=127⇔3x=103x=2827⇔x=log310x=log32827 Chọn A. ====== QUIZ math 12 ===== Source link edu You Might Also Like Lựa chọn đáp án đúng nhất: Quãng đường AB gồm hai đoạn, bác Hà đi đoạn thứ nhất hết 1 giờ 7 phút, sau đó đi tiếp đoạn thứ hai hết thời gian nhiều hơn đoạn thứ nhất là 12 phút. Hỏi bác Hà đi đoạn đường AB hết bao nhiêu thời gian ? – 2023 28/05/2023 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions below.Because writing has become so important in our culture, we sometimes think of it as more real than speech. A little thought, however, will show why speech is primary and writing secondary to language. Human beings have been writing (as far as we can tell from surviving evidence) for at least 5000 years; but they have been talking for much longer, doubtless ever since there have been human beings.When writing did develop, it was derived from and represented speech, although imperfectly. Even today there are spoken languages that have no written form. Furthermore, we all learn to talk well before we learn to write; any human child who is not severely handicapped physically or mentally will learn to talk. a normal human being cannot be prevented from doing so. On the other hand, it takes a special effort to learn to write. In the past many intelligent and useful members of society did not acquire the skill, and even today many who speak languages with writing systems never learn to read or write, while some who learn the rudiments of those skills do so only imperfectly.To affirm the primacy of speech over writing is not, however, to disparage the latter. One advantage writing has over speech is that it is more permanent and makes possible the records that any civilization must have. Thus, if speaking makes us human, writing makes us civilized. The word “advantage” in the last paragraph most closely means ______. – 2023 25/07/2023 NYT Crossword Answers for June 30, 2023 – 2023 30/06/2023 Trả lời HủyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Lưu tên của tôi, email, và trang web trong trình duyệt này cho lần bình luận kế tiếp của tôi.