Page 19 - CHƯƠNG II: GIẢI TÍCH 12-12a2
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Trường THPT Châu Phú                      Chương II: Mũ – Lôgarit                          INOXHTT

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            Câu 149:  log  8.log 81 bằng:
                          3     4
                    A. 8          B. 9          C. 7           D. 12
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            Câu 150: Phương trình: 3 +  x  4 =  x  5  có nghiệm là:
                                              x
                    A. 1          B. 2          C. 3           D. 4

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            Câu 151:  log   3.log 36  bằng:
                          6      3
                    A. 4          B. 3          C. 2           D. 1
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                                               x
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            Câu 152: Cho phương trình 4 −   3.2 + 2 0. Nếu đặt t = 2  với t > 0 thì phương trình tương đương với
                                         x
                                                                     x
            phương trình nào:
                    2
                                                                                        2
                                                                  2
                                             2
                A.  t  +3t -2 = 0        B. t  -3t +2 = 0      C. t  + 3t +2 = 0    D. t  -3t - 2 = 0
            C©u 153:  log  8.log 81 b»ng:
                          3     4
                    A. 8          B. 9          C. 7           D. 12

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            Câu 154: Hàm số y =  log 4x x    2 )  có tập xác định là:
                                     5
                    A. (2; 6)            B. (0; 4)             C. (0; +∞)           D. R
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            Câu 155: Hàm số nào dưới đây đồng biến trên tập xác định của nó?

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