Câu hỏi trắc nghiệm (10 câu):
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- A. a < 0, b > 0
- B. 0 < a ≠ 1, b < 0
- C. 0 < a ≠ 1, b > 0
- D. 0 < a ≠ 1, 0 < b ≠ 1
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- A. \({a^b} = N\)
- B. \({\log _a}N = b\)
- C. \({b^N} =a\)
- D. \({a^N} = b\)
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- A. \({\log _a}1 = 1\)
- B. \({\log _a}a = a\)
- C. \({\log _a}1 = 0\)
- D. \({\log _a}a = 1\)
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- A. \({\log _{{a^n}}}b = - n{\log _a}b\)
- B. \({\log _{{a^n}}}b = \frac{1}{n}{\log _a}b\)
- C. \({\log _{{a^n}}}b = -\frac{1}{n}{\log _a}b\)
- D. \({\log _{{a^n}}}b = n{\log _a}b\)
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- A. lna = b ⇔ b = 10\(^a\)
- B. lna = b ⇔ a = eb
- C. lna = b ⇔ b = ea
- D. lna = b ⇔ a = 10b
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- A. ln(ab) = lna + lnb
- B. \(\ln {\left( {{a^2} - b} \right)^3} = 3\ln \left( {{a^2} - b} \right)\)
- C. \(\ln \left( {\frac{a}{b}} \right) = \ln \left( a \right) - \ln \left( { - b} \right)\)
- D. \(\ln {\left( {\frac{a}{b}} \right)^2} = \ln {a^2} - \ln {b^2}\)
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- A. \({\log _a}b\)
- B. \({\log _b}a\)
- C. \({\ln _a}b\)
- D. \({\ln _b}a\)
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- A. \({\log _5}2\)
- B. \(2{\log 5}\)
- C. \(\log 25\)
- D. \({\log _2}5\)
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- A. x ≤ 3
- B. x > 3
- C. x ≥ 3
- D. x < 3
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- A. \(x = \frac{1}{8}\)
- B. \(x =- \frac{1}{8}\)
- C. \(x = \frac{1}{4}\)
- D. \(x = \frac{3}{8}\)
