જો $\log _{10} 7 = a$ હોય,તો $\log _{10} \left( \frac{1}{70} \right)$ ની કિંમત કેટલી થાય?

  • A
    $-(1+a)$
  • B
    $(1+a)^{-1}$
  • C
    $\frac{a}{10}$
  • D
    $\frac{1}{10a}$

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$x>0$ માટે,જો $y=\frac{10^{\log _{10} x}}{x^{2}}$ અને $x=y^{a}$ હોય,તો $a=$

$\log _{2} 16$ ની કિંમત શોધો.

જો $\log_{10} 2 = 0.3010$ હોય,તો $\log_{10}(1/2) =$

જો $\log (2 a-3 b)=\log a-\log b$ હોય,તો $a=$

જો $(4.2)^{x} = (0.42)^{y} = 100$ હોય,તો $\frac{1}{x} - \frac{1}{y} = $

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