Question

解方程 lgx*lg x/10=6

Answer 1

因为lgx(lgx-lg10)=6,所以(lgx)^2-lgx-6=0,令lgx=t,则t^2-t-6=0,即(t+2)(t-3)=0,所以t=-2或t=3,回带lgx得：lgx=-2或lgx=3.对数式改指数式得：x=1/100或x=1000.