log 10(9/300)=log 10(3/100)

=log 10(3)-log 10(100)

=log 10(3)-log 10(10^2)

=log 10(3)-2 log* 10(10)

=log 10(3)-2*1

=log 10(3)-2

log 10(9/300)=log 10(3)-2

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