计算log5 根号2*log49 81 log25 1 3*log7 三倍根号4
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lg1/4-lg25=lg(1/4)/25=lg1/100=-22log510+log50.25=log510^2+log50.25=log5100+log50.25=log5100*0.25=log
用换底公式,原式=[(1/2)(lg2*/lg5)*(4lg3)/(2lg7)]/{[lg(1/3)/(2lg5)]*[(2/3)lg2/lg7}=(2lg2*lg3)/2lg5lg7)*[(-2lg
log5(35)+2log0.5(根号2)-log5(0.02)-log5(14)=log[35/(0.02*14)]-1=log125-1=2
2log5^10+log5^0.25=2lg10/lg5+lg0.25/lg5=lg100/lg5+lg0.25/lg5=(lg100+lg0.25)/lg5=lg25/lg5=2lg5/lg5=2希
原式=lg25/lg4-2lg10/lg4+lg9/lg2×lg√5/lg3×lg2/lg5=(2lg5)/(2lg2)-2/(2lg2)+(2lg3)/lg2×(½lg5)/lg3×lg2
答案是1.要用到换底公式logA(B)=lnB/lnA那么原式=(ln9/ln2)*(ln(根号5)/ln3)*(ln5/ln2)=2ln3/ln2*(1/2ln5)/ln3)*ln5/ln2你自己在
(log5根号2*log4981)/(log251/3*log74开3次方)=(1/2log52*log79)/(1/2log51/3*1/3log74)=—3
log5(35)-2log5(7/3)+log5(7)-log5(1.8)=log5(35*(7/3)^(-2)*7/1.8)=log5(25)=2
log5(35)-log5(1/50)-log5(14)+2log1/2(根号2)=log5(35/(1/50))-log5(14)+2log2(根号2)=log5(35*50))-log5(14)+
2log5{10}+log5{0.25}=log5{10^2}+log5{0.25}=log5(100*0.25)=log5(5^2)=2
利用公式lga^b=blga知:lg25=2lg5,lg9=2lg3,lg2倍根号2=(3/2)*lg2log2^25*log3^2倍根号2*log5^9(利用loga^b=lga/lgb,化成同底形
由lg8000=lg8+lg1000=3lg2+3=3(lg2+1)lg2^√3=√3lg2所以原式=lg5*lg8000+(lg2^√3)^2=3lg5((lg2+1))+(√3lg2)^2=3lg
log2^5*log3^2倍根号2*log5^9=lg5*lg2倍根号2*lg9/(lg2*lg3*lg5)=3*lg5*lg2*lg3/(lg2*lg3*lg5)=3再问:log2^25*log3^
原式=log5(35)-log5[(7/3)²]+log5(7)-log5(1.8)=log5(35÷49/3×7÷1.8)=log5(5/6)
原式=2log5(10乘以0.5)+0+3=2log55+0+3=2+3=5
根号5的log5(-a)^2次方=5的1/2Xlog5(-a)^2次方=5的log5(-a)^2x1/2次方=5的log5(-a)=-a
因为根号下3加2倍根号2等于根号2加1所以1/根号[3加2根号2]等于根号2-1所以log根号2-1底[根号2-1]=1所以log5底1=0完
=3lg2/lg3×3lg3/2lg2+5^(log55/2)+4/9-1=9/2+5/2+4/9-1=6+4/9再问:5^(log55/2)怎么来的?再答:1-log52=log55-log52=l
=7^6-6LOG56再问:怎么得的再答:根号即为指数的分母12除以2得到所以是7的6次方第二个36可写成6的平方米得2倍的LOG56(对不起上面写出成了6倍)即7^6-2LOG56
(log3^4+log5^2)(log2^9+log2^根号3)=(lg4/lg3+lg2/lg5)(lg9/lg2+lg根号3/lg2)=(2lg2*lg5+lg2*lg3)/lg3*lg5*(lg