У=5 <span> х=1 х=-1
у=0,2 </span><span> х=0,2 х=-0,2
у=-2 х=корней нет
у=0 х=0
</span>
v(3)3-v(6)12/2= v3(3)-v3(3)*v2(4/2)=v3(3)-2v3(3)/2=-v3(3)/2=-3/2v3(3)<0
2-v2-v3/(2+v2-v3)= 2-(v2+v3)/(2+(v2-v3))=(2-(v2+v3)*(2+(v2-v3))/(2+(v2-v3))^2=4-(v2-v3)^2/(4+4(v2-v3)+(v2-v3)^2=4-2+2v6-3/(4+5(v2-v3)^2)=-1+2v6/(4+5(v2-v3))^2=
2v6-1)(2v6+1)/(4+5(v2-v3)^2)*(2v6+1)=4*6-1/(4+(v2-v3)^2)*(2v6+1)=23/(4+(v2-v3)^2)*(2v6+1)>0
<span>a<−2,<span>
a+2<0⇒Ia+2I=-a-2
</span></span><span> то <span>1−|a+2|=1+a+2=<u>3+a</u></span></span>