(1/4)^log以4为底3+(1/5)^log以4为底3-(1/3)^log以3为底5 求值
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(1/4)^log以4为底3+(1/5)^log以4为底3-(1/3)^log以3为底5 求值
(1/4)^log以4为底3+(1/5)^log以5为底3-(1/3)^log以3为底5
=1/3+1/3-1/5
=7/15
再问: 利用对数恒等式a^log以a为底N=N
再答: 对啊,就是利用对数恒等式a^log以a为底N=N
再问: (1/4)^log以4为底3求出是1/3
再答: (1/4)^log以4为底3 =4^-log以4为底3 =4^log以4为底3的-1次方 =4^log以4为底1/3 =1/3
=1/3+1/3-1/5
=7/15
再问: 利用对数恒等式a^log以a为底N=N
再答: 对啊,就是利用对数恒等式a^log以a为底N=N
再问: (1/4)^log以4为底3求出是1/3
再答: (1/4)^log以4为底3 =4^-log以4为底3 =4^log以4为底3的-1次方 =4^log以4为底1/3 =1/3
如果log以3为底[log以4为底(log以5为底的a次方)]等于log以4为底[log以3为底(log以5为底的b次方
(log以5为底根号2的对数×log以49为底81的对数)÷(log以25为底1/3的对数×log以7为底4的3次方根的
log以3为底9+log以4为底16分之1=.
计算:(log以4为底3的对数+log以8为底3的对数)(log以3为底2的对数+log以9为底2的对数)- log以½
log以5为底(3x-2)>log以5为底(x+1)
log以4为底3为真数×log以9为底2的对数×log以1/2为底4根号32
log以2为底的(log以3为底的(log以4为底的x))=log以3为底的(log以4为底的(log以2为底的y))=
log以9为底4的对数+ log以3为底8的对数除以log以1/3为底16的对数
log以4为底8的对数-log以9分之1为底3的对数-log以根号2为底4的对数
(log以3为底的2+log以9为底的2)乘(log以4为底的3+log以8为底的3)=
化简(log以4为底3的对数+log以8为底3的对数)乘(log以3为底2的对数+log以9为底2的对数)
(log以4为底3的对数+log以8为底3的对数)*(log以3为底2的对数+log以9为底2的对数)