ax²+6x-2-35/(x²+6x)=0x²+6x=aa-2-35/a=0a²-2a-35=0,a≠0a1+a2=2 U a1*a2=-35a1=-5 U a2=7x²+6x=-5x²+6x+5=0x1+x2=-6 U x1*x2=5x1=-5 U x2=-1x²+6x=7x²+6x-7=0x1+x2=-6 U x1*x2=-7x1=-7 x2=1Ответ x={-7;-5;-1;1}2(x²-x+1)/(x²+3x+5)+(x²+3x+5)/(x²-x+1)=2(x²-x+1)/(x²+3x+5)=aa+1/a=2a²-2a+1=0,a≠0(a-1)²=0a-1=0a=-1(x²-x+1)/(x²+3x+5)=1x²+3x+5=x²-x+1x²+3x-x²+x=1-54x=-4x=-1