证明log(xy)=log(x)+log(y)或者ln(xy)=ln(x)+ln(y)一个意思
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证明log(xy)=log(x)+log(y)或者ln(xy)=ln(x)+ln(y)一个意思
证明log(xy)=log(x)+log(y)
或者ln(xy)=ln(x)+ln(y)
一个意思
证明log(xy)=log(x)+log(y)或者ln(xy)=ln(x)+ln(y)一个意思
对数比较抽象,可以用指数形式表示
log(a)x + log(a)y
设m=log(a)x ,n=log(a)y
则a^m=x ,a^n=y
可得a^m * a^n=a^(m+n)=xy
得log(a)x + log(a)y=m+n=log(a)xy
相减同理
证明log(xy)=log(x)+log(y)或者ln(xy)=ln(x)+ln(y)一个意思
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