Question

определите x , если lgx=1+2lg3 - 2/3 lg125

Answer 1

 1+2lg3 - 2/3 lg125= lg10+ lg9-2/3*3 lg5= lg10+ lg9- lg25= lg(10*9/25)= lg(18/5)

lgx=lg(18/5)

х=18/5=3,6