1)lgx=-2 (2)lgx=21ga-lgb (3)lnx=0.7 (4)lnx=1-ln4过程

问题描述:

1)lgx=-2 (2)lgx=21ga-lgb (3)lnx=0.7 (4)lnx=1-ln4过程

(1)lgx=-2
x=10^(-2)=1/100
(2)lgx=21ga-lgb
lgx=lg(a²/b)
x=a²/b
(3)lnx=0.7
x=e^0.7
(4)lnx=1-ln4
lnx=ln(e/4)
x=e/4