Page 29 - CHƯƠNG II: GIẢI TÍCH 12-12a2
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Trường THPT Châu Phú                      Chương II: Mũ – Lôgarit                          INOXHTT
            Câu 207: Cho f(x) =  x. x . Khi đó f(0,09) bằng:
                                    6
                                 3
                    A. 0,1        B. 0,2        C. 0,3         D. 0,4
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            Câu 208: Trong các phương trình sau đây, phương trình nào có nghiệm?

                         1                                         1         1           1
                                                                                             =
                                                                         −
                                                − + =
                    A.  x  + 1 = 0       B.  x 4 5 0           C. x +  (x 1 ) =   D. x −  4  1 0
                                                                   5
                                                                                 0
                         6
                                                                             6
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            Câu 209: Nếu   1 ( a +    a − ) 1=   thì giá trị của  là:
                           2
                    A. 3          B. 2          C. 1           D. 0

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                            
                                
            Câu 210: Cho  >  . Kết luận nào sau đây là đúng?
                    A.  <              B.  >               C.  +  = 0         D. . = 1
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                                  1   1    2     y  y   − 1
                                            −
            Câu 211: Cho K =  x −    y  2         1 2  +     . biểu thức rút gọn của K là:
                                  2
                                              x   x  
                    A. x          B. 2x         C. x + 1       D. x - 1
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            Câu 212: Rút gọn biểu thức:  81a b , ta đợc:
                                              4
                                                2
                    A. 9a b       B. -9a b      C. 9a b               D. Kết quả khác
                         2
                                        2
                                                      2
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