log2 x × log2 2x= log根号2 2x (真数分别为x ,2x,2x ,底数分别为2,2,根号2)求解题过称和思路
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log2x×log22x=log根号22x(真数分别为x,2x,2x,底数分别为2,2,根号2)求解题过称和思路log2x×log22x=log根号22x(真数分别为x,2x,2x,底数分别为2,2,
log2 x × log2 2x= log根号2 2x (真数分别为x ,2x,2x ,底数分别为2,2,根号2)求解题过称和思路
log2 x × log2 2x= log根号2 2x (真数分别为x ,2x,2x ,底数分别为2,2,根号2)
求解题过称和思路
log2 x × log2 2x= log根号2 2x (真数分别为x ,2x,2x ,底数分别为2,2,根号2)求解题过称和思路
呃.
..用换底公式可得
右边等于2log2 2x对吧.
然后就是log2 x X log2 2x=2log2 2x
则log2 2x=0 或者log2 x=2
解x=1/2 或4
这类题只有底数相同,要不怎么能做呢?那么就把他换成相同的就可
比较这几个底数的联系
明白了呢?
X=1吧。你把等式右边底数根号换成2的1/2次方,就可以提到log前面了右拭为2log2 2x-------------假如log2 2x不等于0消去得log2 x=2 x=1
若log2 2x=0,X=1/2
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