log(x^2-5x+6)=log1/2(2) x^2-5x+6=2 x^2-5x+4=0 D=25-16=9 x1=(5+3)/2=4 проверка log1/2(4^2-5*4+6)=-1 log1/2(16-20+6)=-1 log1/2(2)=-1 -1=-1 x2=(5-3)/2=1 проверка log1/2(1^2-5*1+6)=-1 log1/2(2)=-1 -1=-1