log2(x-2)=log4(5-x)
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log2(x-2)=log4(5-x)log2(x-2)=log4(5-x)log2(x-2)=log4(5-x)log4(5-x)=1/2log2(5-x)=log2(5-x)½=log2
log2(x-2)=log4(5-x)
log2(x-2)=log4(5-x)
log2(x-2)=log4(5-x)
log4(5-x)=1/2log2(5-x)=log2(5-x)½=log2(x-2)
因为log2 x为单调函数,
所以(5-x)½=(x-2)解得x=(3±√13)/2
又因为x定义域为﹙2,5﹚,所以x=(3﹢√13)/2
log(x)是单调递增函数,所以2(x-2)=4(5-x),
,x=4
log4(5-x)=1/2log2(5-x)
所以(5-x)的1/2次方=(x-2),即(x-2)的平方=(5-x),定义域2<x<5,所以x=(3+根号下13)/2
log2(x-2)=log4(5-x)
log4(log2^x)=log2(log4^x)求log2^x
log2^x=log4^9
log4 (x+2) - log2 (x-1) = 是不是要把log4 转换成log2
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