计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
问题描述:
计算1.2log以5为底10+log以5为底0.25 2.已知lg2=0.3010,lg3=0.4771,求lg根号下45 3.【(1-log以6为底3)²+log以6为底2*log以6为底18】*log以4为底6
答
1.2log以5为底10+log以5为底0.25 =2log以5为底10+2log以5为底0.5 =2log以5为底10×0.5=2log以5为底5 =22.已知lg2=0.3010,lg3=0.4771,lg根号下45=lg3+1/2lg5=lg3+1/2(1-lg2)=0.4771+1/2×(1-0.3010)=0.4771+0.3345=0....