9х^2-6x+1=0 D=36-1*4*9=0 x= -b/2а=6/18=1/3 (х-1/3) 2) 9х^2=1 x=1/3 х= -1/3 (х+1/3)(х-1/3) 3) ответ. 1/(х+1/3)