аx²+3x+2=0x1+x2=-3 U x1*x2=2⇒x1=-1 U x2=-2x/(x+1)+(4x+5)/(x+1)(x+2)=0ОЗ (x+1)(x+2)≠0⇒x≠-1;x≠-2x(x+2)+4x+5=0x²+2x+4x+5=0x²+6x+5=0x1+x2=-6 U x1*x2=5x1=-5x2=-1не удов услОтвет х=-5бx²+x-6=0x1+x2=-1 U x1*x2=-6⇒x1=-3 U x2=2x²/(x-2)-15/(x+3)(x-2)+x/(x+3)=xОЗ (x+3)(x-2)≠0⇒x≠-3;x≠2x²(x+3)-15+x(x-2)=x(x²+x-6)x³+3x²-15+x²-2x-x³-x²+6x=03x²+4x-15=0D=16+180=196x1=(-4-14)/6=-10/3x2=(-4+14)/6=5/3