3/2lg4怎么得来的
追答3lg2=3lg根号下(4)=3/2lg4
=lg(√27*8/√1000)/lg1.2
=lg[6√6/(5√5)] /lg(6/5)
=log(6/5)[6√6/(5√5)]
=log(6/5)[(6/5)^(3/2)]
=3/2
!!!急(lg根号下27+lg8-lg根号下1000)\\lg1.2=(3\/2lg3+3lg2-3\/2)\/lg1....
=（3\/2lg3+3\/2lg4-3\/2)\/lg1.2=3\/2lg(3*4\/10)\/lg1.2=3\/2
计算:(lg根号下27+lg8-lg根号下1000)\\lg1.2
（lg根号下27+lg8-lg根号下1000）\\lg1.2= [lg 3^(3\/2)+lg 2^3-lg 10^(3\/2)]\/lg1.2=3\/2(lg3+lg4-lg10)\/lg1.2 =3\/2 仅供参考
计算(lg根号27+lg8-lg根号1000)\/lg1.2
lg根号27+lg8-lg根号1000=lg[根号(27x8^2\/1000)]=lg1.2^3\/2(注：1.728=1.2x1.2x1.2)原式=3\/2
lg的计算题 (lg根号下27+lg8-lg根号下1000)\/lg1.2
=(lg27^1\/2+3lg2-3\/2)\/lg12\/10 =(3\/2lg3+3lg2-3\/2)\/(lg3+lg4-lg10)=[3\/2(lg3+2lg2-1)]\/(lg3+2lg2-1)这里看见了啊 可以上下约分的 =3\/2
(lg根号27+lg8-lg根号1000)\/lg1、2
（lg√27+lg8-lg√1000）\/lg1.2 =(3lg3\/3+3lg2-3lg10\/2)\/lg1.2 =3\/2(lg3+2lg2-lg10)\/lg1.2 =3\/2lg1.2\/lg1.2 =3\/2
计算(lg√27+lg8-lg√1000)\/lg1.2.的值
原式==[lg3^(3\/2)+lg2^3-lg10^(3\/2)]\/(lg1.2) =[lg3^(3\/2)+lg4^(3\/2)-lg10^(3\/2)]\/(lg1.2) =(3\/2)(lg3+lg4-lg10)\/(lg1.2) =(3\/2)lg(3*4\/10)\/lg1.2=(3\/2)lg1.2\/lg1.2=3\/2
对数. (lg根号27 +lg8 -3lg根号10)\/lg1.2
(lg根号27 +lg8 -3lg根号10）\/lg1.2 =[(3\/2)lg3+3lg2-3\/2]\/(lg3+2lg2-1)=(3\/2)(lg3+2lg2-1)\/(lg3+2lg2-1)=3\/2
计算(lg根号27+lg8-3lg根号10)除以lg1.2,要过程
（lg根号27+lg8-3lg根号10）\/lg1.2 = [lg3^(3\/2) + lg2^3 - 3lg10^(1\/2)] \/ lg(6\/5)= (3\/2 lg3 + 3lg2 - 3\/2) \/ (lg6 - g5)= [(3\/2 lg3 + 3\/2 lg2) + (3\/2 lg2 - 3\/2)] \/ (lg6 - lg5)= [3\/2 lg6 + 3\/2 lg(1\/5)] \/ (lg6 - lg5...
对数的计算题
你的题目应该是(lg√27+lg8-lg√1000)\/lg1.2吧？要用到的几个公式：lg(a^b)==b*lga lga+lgb=lg(a*b)lga-lgb=lg(a\/b)所以原式=lg(√27*8\/√1000)\/lg1.2 =lg(√3^3*√4^3\/√10^3)\/lg1.2 =lg√(3*4\/10)^3\/lg1.2 =lg1.2^(3\/2)\/lg1.2 =3\/2*lg1.2\/lg1...
