log2.5 6.25 lg5 ln根号e 2

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log2.5 6.25 lg5 ln根号e 2
log2 3/log2 5等于log2 3-log2 5么?

真数的商可以写成对数的差,这是两个对数的商,㏒2(3)/㏒2(5)=㏒3(5).

不等式log2(x2-x)

令x^2-x=t(t>0)log2t

2^(log2^(-3))=

令x=2^log2^(-3)则log2(x)=log2(-3)X=-3

log2 7等于多少

log2以为底7的对数=以10为底2的对数除以l10为底7的对数,再查对数表即可

log2 3乘以log2 3等于2log2

log23+log23=2log23log23乘以log23等于2log23这个是错解但是对于高中对数的一般乘法还没有学不用掌握只需掌握加减法等即可再答:哪里不懂的话请追问理解的话给个采纳哦谢了再问:

log2 3等于多少?

这只能用计算器了log(2)3=1.5849625007211561814537389439478

log4(log2^x)=log2(log4^x)求log2^x

如果log4(log2^x)是表示外面的log以4为底,而里面的log以10或其它数(>0)为底的话,则log4(log2^x)=[log2(log2^x)]/2=log2(log4^x)=log2(

若log2(m)

首先把log1/2(n)化成-log2(n)再化成log2(1/n),然后把1看做log2(2)所以式子变为log2(m)

log2(x²+1)

log2(x²+1)

不等式|log2^x-1|

答:|log2(x)-1|

log2(x-1)

log2(x-1)

|2x-log2^x|

x>=0时,2x-log2^x>=0且log2^x>=0由原式可得:2x-log2^x0所以xlog2>0所以x>0x

log2 SQR(7/48)+log2 12 -1/2log2 48

log2SQR(7/48)+log212-1/2log248=0.5log27+0.5log248+log212-1/2log248=0.5log27+log212=log21008

log2 3×log3 7=log2 7

没有错...换底公式的运用于逆运用.log(2)(3)xlog(3)(7)=ln3xln7/ln2xln3=ln7/ln2=log(2)(7)

(log2 9)/(log2 8) = 2/3(log2 3)

log(2,9)=log(2,3^2)=2log(2,3)log(2,8)=log(2,2^3)=3log(2,2)=3所以(log2,9)/(log2,8)=2/3(log2,3)

log2 SQR(7/48)+log2 12 -1/2log2 42

log2√(7/48)+log212-1/2log242=log2√(7/48)+log2(12)-log2√42=log2√(7/48)*12/√42=log2√7*144/48*42=log2√(

解log2^x

由log2^x

log2 5/4+log2 5

log25/4+log25=log25/4×5=log24=2

log8(9)*log2(3)

log8(9)*log2(3)=lg9/lg8*lg3/lg2=2/3lg3的平方/lg2的平方