lim x--amp;gt;9 x-9/ корень x-3 lim x--amp;gt;2 x^2-5x+6/x^2-4 lim x---amp;gt;2

1
lim(x-3)(x-3)=lim(x+3)=9+3=3+3=6
2
lim(x-2)(x-3)/(x-2)(x+2)=lim(x-3)/(x+2)=(2-3)/(2+2)=-1/4
x-5x+6=0
x1+x2=5 U x1*x2=6x1=2 U x2=3
3
lim(4x+7)(x+2)/(x-2)(x+2)=lim(4x+7)/(x-2)=(-8+7)/(-2-2)=-1/(-4)=1/4
4x+15x+14=0
D=225-224=1
x1=(-15-1)/8=-2 U x2=(-15+1)/8=-7/4
4
lim[((x+7)-4)((x+7)+4)]/[(x-9)((x+7)+4)]=lim(x+7-16)/[(x-9)((x+7)+4)]=
=lim1/((x+7)+4)=1/((9+7)+4=1/(4+4)=1/8