log9*con9等于多少
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原式=log427*log825*log95=lg27/lg4*lg25/lg8*lg5/lg9=3lg3/2lg2*2lg5/3lg2*lg5/2log3=1/2*(lg5/lg2)^2=1/2*(
2.5m等于25dm=250cm=2500mm再问:打错了,是2.5m等于多少m多少dm?
2^(log4^12)-3^(log9^27)+5^(log25^1/3)=2^(log2(根号12))-3^(log3(根号27))+5^(log5(根号1/3)=根号12-根号27+根号(1/3)
(4a-5b)(5b-4a)=-(4a-5b)^2=-(16a^2-40ab+25b^2)=-16a^2+40ab-25b^2
=3/2+1/2=21、log48=log2²2³=3/2log1/93=log3^(-2)3=-1/22、换底公式log48=lg8/lg4=3lg2/(2lg2)=3/2log
log9(45)-log9(5)=log9(45/5)=log9(9)=1
再答:再答:望采纳,谢谢
log9的五次是以9为底数的吗?真数是5的话.那么答案如下1og3的五次/1og3的九次+1og3的七次/1og3九次=1og3的35次/1og3的九次A+B=1og3的35次/1og3的九次因为1o
log9^8×log4^27=lg8/lg9×lg27/lg4=3lg2/2lg3×3lg3/2lg2=3/2×3/2=9/4
5的2倍log以5为底3的对数这个是5的2倍log以5为底3的对数的次方吗?如果是的话,原式=4log3²(2)-[log3(32/9)-log3(8)]-5^log5(3²)=(
log4(9)=2*1/2log2(3)=log2(3)log3(4)=2log3(2)log9(2)=1/2log3(2)[log2(3)+log4(9)][log3(4)+log9(2)]=2lo
logm(n)=logc(n)/logc(m)(c是常数)当C=10时就变成了lg(n)/lg(m)log3(5)+log9(5)=lg5/lg3+lg5/lg9=lg5/lg3+lg5/2lg3=3
五角星1.75、三角形0.5、正方形0.75
log920=lg20/lg9=lg(2*10)-lg3^2=lg2+lg10-2lg3=a+1-2
由log95=a,log97=b得log935=log95+log97=a+b所以log359=1/log935=1/(a+b)
图象过点(9,2)所以2=loga(9)a^2=9a=3所以y=f(x)=log3(x)所以3^y=x所以f-1(x)=3^x所以f-1(log92)=3^(log92)=(9^1/2)^(log92
因为loga(b)=lgb/lga所以原式可化为lg10/lg5=log5(10)
lg2+lg50+3^1-log9(2)=lg100+3^(log9(9)-log9(2))=2+3^(log9(9/2))=2+3^(log(3^2)(9/2))=2+3^(1/2log(3)(9/
因为(log9(8))=(3/2)(ln2/ln3)(log4(3根号3))=(1/3)(ln3/ln2)所以(log9(8))*(log4(3根号3))=1/2再问:不对哦,这的是错误答案·····
解题思路:原式=1-1/2+1/2-1/3+……+1/100-1/101=1-1/101=100/101解题过程: