已知lg2=0.3010,lg3=0.4771,lgx=-2+0.7781,则x=()
问题描述:
已知lg2=0.3010,lg3=0.4771,lgx=-2+0.7781,则x=()
答
lgx=-2+0.3010+0.4771
=lg10^(-2)+lg2+lg3
=lg[10^(-2)×2×3]
=lg0.06
x=0.06