问题标题:
高中数学问题,急!已知lg2=0.3010,lg3=0.4771,求下列各对数的值:(1)lg12=lg(2^2×3)=lg2^2+lg3=0.090601+0.4771=0.22762441(2)lg32=lg(2^2×2^3)=lg2^2+lg2^3=0.090601+0.027270901=0.117871901(3)lg3/2=lg3-lg2=0
问题描述:
高中数学问题,急!已知lg2=0.3010,lg3=0.4771,求下列各对数的值:(1)lg12=lg(2^2×3)=lg2^2+lg3=0.090601+0.4771=0.22762441(2)lg32=lg(2^2×2^3)=lg2^2+lg2^3=0.090601+0.027270901=0.117871901(3)lg3/2=lg3-lg2=0.4771-0.3010=0.1761(4)lg√3/2=lg√3-lg2=0.690724-0.3010=0.389724请问我做得对吗?
樊建席回答:
(1)lg12=lg(2^2×3)=lg2^2+lg3=2lg2+lg3=0.3010*2+0.4771=1.0791(2)lg32=lg(2^5)=5lg2=0.3010*5(3)lg3/2=lg3-lg2=0.4771-0.3010=0.1761这个是对的。(4)lg√3/2=lg√3-lg2=(1/2)lg3-lg2=0.4771/2-0.3010=0.54855
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