不知道向下点 对数运算公式log(a,b)=c 我这么表示b^c=alog(a,c)+log(b,c)=log(ab,c)log(a,c)-log(b,c)=log(a/b,c)log(a^c,b)=(c)log(a,b)log(a,b^c)=(1/c)log(a,b)log(a,b)=log(a,c)/log(b,c)字数限制不证明...