f(x)=-f(-x)=-log1/2(-x) =-lg(-x)/lg(1/2) =lg(-x)/lg2 =log2(-x) lg前面那个负号怎么消去的?

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f(x)=-f(-x)=-log1/2(-x) =-lg(-x)/lg(1/2) =lg(-x)/lg2 =log2(-x) lg前面那个负号怎么消去的?
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f(x)=-f(-x)=-log1/2(-x) =-lg(-x)/lg(1/2) =lg(-x)/lg2 =log2(-x) lg前面那个负号怎么消去的?
f(x)=-f(-x)=-log1/2(-x) =-lg(-x)/lg(1/2) =lg(-x)/lg2 =log2(-x) lg前面那个负号怎么消去的?

f(x)=-f(-x)=-log1/2(-x) =-lg(-x)/lg(1/2) =lg(-x)/lg2 =log2(-x) lg前面那个负号怎么消去的?
lg(1/2)
=lg(2^-1)
=-lg2