x^(lgx+1) -100=0
x^(lgx+1) =100
两边同时取对数
lg[x^(lgx+1)] =lg100
(lgx+1)lgx=2
(lgx)²+lgx-2=0
(lgx-1)(lgx+2)=0
lgx=1或lgx=-2
x=10或x=0.01两边同时取对数能解说下谢谢如果a=b那么lga=lgb所以因x^(lgx+1) =100即lg[x^(lgx+1)] =lg100