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

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $2$

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જો $\log _{10} 50+\log _{10} 20=x$ હોય,તો $x$ ની કિંમત કેટલી થાય?

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$\frac{\log _{9} 11}{\log _{5} 13}-\frac{\log _{3} 11}{\log _{\sqrt{5}} 13}=$

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