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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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
log2^(x^log2^x)=?
log2 (x + 3) + log2(x + 2) = 1log2 (x + 3) + log2(x + 2) = 1
log2(x – 2 ) + 2 = log2(5)log2(x – 2 ) + 2 = log2(5)
log2(x – 2 ) + 2 = log2(5)log2(x – 2 ) + 2 = log2(5)
log2 4+log2 (x+2)怎么算?log2 4+log2 (x+2)=log2 (4x+8)
log2(2x)*log2(x)=2 x=?
f(x)=log2(x/8)*log2(2/x)
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log2(-x)=x+
|2x-log2^x|
求导 y=log2(x^2)-log2(x)
求解log2(3x)=log2(2x+1)
解方程log2(2-x)=log2(x-1)+1
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log2 (x+1)+log2 x=log6
|[log2(x)]^2-3log2(x)+1|
化简:(log2(x/4))*(log2(x/2))
解方程log2(x+14)-log2(x+6)=3-log2(x+2)