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1、og(a) (M·N）=log(a) M+log(a) N log(a) (M÷N)=log(a) M-log(a) N log(a) M^n=nlog(a) M log(a)b*log(b)a=1 log(a) b=log (c) b÷log (c) a希望能帮你忙。

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