2^(X-3)=5^(1-X) ,X是什么?哦对了^就是次方哈,用log求...
问题描述：
2^(X-3)=5^(1-X) ,X是什么?哦对了^就是次方哈,用log求...
答
2^(X-3)=5^(1-X)
log[2^(X-3)]=log[5^(1-X)]
(x-3)log2=(1-x)log5
x(log2+log5)=log5+3log2
x=(log5+3log2)/(log2+log5)