Must the base a in logarithm loga (x) be greater than 0? For example, does the base a have to be greater than 0 in senior high school?

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• 1. If we know that loga x = 2, logb x = 1, then the logarithm of a (root B3) is? I calculate a = x = B But then I don't know what to do
• 2. Logarithmic calculation Let log83 = P, log35 = q, then lg5 =?
• 3. How to calculate logarithm?
• 4. How to multiply two logarithms of the same base
• 5. What's the logarithm 10log2^2n+10log3/2=6n+1.8 That's what it says in the book. I majored in communication, but this mathematical problem should not affect the solution What is the ratio of output signal to noise? Then: [S / DQ] DB = 10log3 / 2 (2 ^ 2n) = 10log2 ^ 2n + 10log3 / 2 = 6N + 1.8 [DB]
• 6. What does LG ^ 2 (3) mean? I mean the logarithm of 3 of LG ^ 2 with the base of 10
• 7. It is known that LG2 = A and Lg3 = B. try to use a and B to express the logarithm with 5 as the lower 12
• 8. It is known that LG2 = a, Lg3 = B is expressed as LG18 / 25 by a, B
• 9. Known LG2 = a, Lg3 = B, try a, B for the following logarithm (fast! Thank you! lg（6） log3(4) log2(12) lg(3/2) It's true in brackets
• 10. Why is the logarithm of LG's 0.00001 equal to - 5?
• 11. F (x) = loga | loga x | (00), that is, X is not equal to 1 and x > 0 （2）loga | loga x|>1 | loga x|
• 12. When 0 ＜ X & # 171; 0.5 and 4 ＜ loga (x), what is the value range of a
• 13. If loga23 > 1, then the value range of a is______ ．
• 14. loga(2/3)
• 15. If loga (A2 + 1)
• 16. If loga (a + 2) > loga (a + 1), then the value range of a is___ .】 +∞）
• 17. If loga (12 / A-1) < 1, then the value range of a is
• 18. If three fourths of loga is less than 1, what is the range of a?
• 19. If a is the logarithm of the bottom 3 / 4 < 1, (a > 0 and a is not equal to 1), find the value range of the real number a?
• 20. If the function f (x) = 1 + log (a) x is a decreasing function in the interval (0, positive infinity), then the value range of a?