1/2x^2-1/6x^2-5/6x-1/2=0
1/3x^2-5/6x-1/2=0|*6
2x^2-5x-3=0
D=25-4*2*(-3)=25+24=49
x=(5+7)/4 x=3
или или
x=(5-7)/4 x=-1/2
S={-1/2;3}
1/2x^2-1/6x^2-5/6x-1/2=0
1/3x^2-5/6x-1/2=0|*6
2x^2-5x-3=0
D=25-4*2*(-3)=25+24=49
x=(5+7)/4 x=3
или или
x=(5-7)/4 x=-1/2
S={-1/2;3}