Помогите решить log3 13/log81 13
log13 81/log13 3=4*log13 3/log13 3=4
log3 13=1/log13 3
log81 13=1/log13 3^4
log3 13/log81 13=log13 3^4/log13 3=4log13 3/log13 3=4