1/log5^7+1/log3^7+1/log2^7 ,求值

1/log5^7+1/log3^7+1/log2^7 ,求值 为什么1/log5(3)等于log3(5) ? 2007*log5(1)+log4(27)*log3(4) log5·log5(3)·log5(1/3)log3(5)·log5(3)·log5(1/3)log3(2)·log5(3)·log8(5)不好意思 1、计算log5^35+2log1/2^根号2-log5^1/50-log5^14 2、已知log3^7=a,log2^3=b,求log21^28 log3^2*log5^7/log9^1/7*log125^82.log2^3=1-a/a,则log3^12= 计算log2 6-log2 3,lg5+lg2,log5 3+log5 1/3,log3 5-log3 15 已知log5(log3(log2x))=1,求X log5[log3(log2^x)]=1,x= 8^(-1/3)+log3(1/27)+log6(5)*[log5(2)+log5(3)]+10^lg3=? log4(log5 a)=log3(log5 b)=1,求a/b. log2(2)+log5(1)-log1/3(1/27)+[3^log3(5)]^2+3^-log3(2)=? 化简:log2 2+log5 1-3^(2log9 5)+(3log3 5)^2+3^log3 2 比较1/log5(19)+2/log3(19)+3/log2(19) 和 1/log2（派）+2/log5（派）大小 求 log5（35）+ 2log0.5（根号2）-log3（1/27）-log3（1/15）-log5（21） 求下列各式的值 1）log2 6+log2 3 2)lg5+lg2 3)log5 3+log5 三分之一 4）log3 5-log3 15 证明1/log5(16)+1/2log3(16)+1/3log2(16)＜1 利用对数的换地公式,计算log2 1/25*log3 1/8*log5 1/9