(Х^2-8,5х+4)/(х^2-9х+81)
х^2-8,5х+4=(x-0,5)(x-8)
D=(8,5)^2-4•4=72,25-16=56,25
X1=(8,5-7,5)/2=1/2=0,5
X2=(8,5+7,5)/2=16/2=8
2)x^2-9x+8=(x-1)(x-8)
D=9^2-4•8=81-32=49
X1=(9-7)/2=1
X2=(9+7)/2=16/2=8
(Х^2-8,5х+4)/(х^2-9х+81)=(x-0,5)(x-8)/(x-1)(x-8)=
(X-0,5)/(x-1)