А x²+3x+2=0 x1+x2=-3 U x1*x2=2⇒x1=-1 U x2=-2 x/(x+1)+(4x+5)/(x+1)(x+2)=0 ОЗ (x+1)(x+2)≠0⇒x≠-1;x≠-2 x(x+2)+4x+5=0 x²+2x+4x+5=0 x²+6x+5=0 x1+x2=-6 U x1*x2=5 x1=-5 x2=-1не удов усл Ответ х=-5 б x²+x-6=0 x1+x2=-1 U x1*x2=-6⇒x1=-3 U x2=2 x²/(x-2)-15/(x+3)(x-2)+x/(x+3)=x ОЗ (x+3)(x-2)≠0⇒x≠-3;x≠2 x²(x+3)-15+x(x-2)=x(x²+x-6) x³+3x²-15+x²-2x-x³-x²+6x=0 3x²+4x-15=0 D=16+180=196 x1=(-4-14)/6=-10/3 x2=(-4+14)/6=5/3
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Аx²+3x+2=0
x1+x2=-3 U x1*x2=2⇒x1=-1 U x2=-2
x/(x+1)+(4x+5)/(x+1)(x+2)=0
ОЗ (x+1)(x+2)≠0⇒x≠-1;x≠-2
x(x+2)+4x+5=0
x²+2x+4x+5=0
x²+6x+5=0
x1+x2=-6 U x1*x2=5
x1=-5
x2=-1не удов усл
Ответ х=-5
б
x²+x-6=0
x1+x2=-1 U x1*x2=-6⇒x1=-3 U x2=2
x²/(x-2)-15/(x+3)(x-2)+x/(x+3)=x
ОЗ (x+3)(x-2)≠0⇒x≠-3;x≠2
x²(x+3)-15+x(x-2)=x(x²+x-6)
x³+3x²-15+x²-2x-x³-x²+6x=0
3x²+4x-15=0
D=16+180=196
x1=(-4-14)/6=-10/3
x2=(-4+14)/6=5/3