X^2-9x+14=0 D=81-56=25 x1=7 x2=2 x^2-4x+4=(x-2)^ 2 значит ((x-7)(x-2))/(x-2)^ 2=(x-7)/(x-2) 3x^2+7.5x-27=6x^2+15x-54 3x^2+10.5x-13.5=6x^2+21x-27 6x^2+15x-54=0 D=225+1296=1521=39^2 x1=-15+39)/2=12 x2=-15-39=-27 (x+27)(x-12) 6x^2+21x-27=0 D=441+648=1089=33^2 x1=-21-33)/2=-27 x2=-21+33)/2=6 (x+27)(x-6) ((x+27)(x-12))/((x+27)(x-6))= (x-12)/(x-6)