39.24.1)lim√2x-6=√2*3,5-6=√7-6=√1=12)=(5+2)/(3+2+4)=7/939.271)=limx(x-3)/(x-3)=limx=32)=lim(x+5)/x(x+5)=lim1/5=1/539.281)=lim(x-5)(x+5)/(x-5)=lim(x+5)=(5+5)=102)=lim(3+x)/(x+3)(x-3)=lim1/(x-3)=1/(-3-3)=-1/639.291)lim(x+1)/(x-3)(x+1)=lim1/(x-3)=1/(-1-3)=-1/4x²-2x-3=0x1+x2=2 U x1*x2=-3⇒x1=3 U x2=-1⇒x²-2x-3=(x-3)(x+1)2)x²-11x+18=0x1+x2=11 U x1*x2=18⇒x1=9 U x2=2, x²-11x+18=(x-9)(x-2)lim(x-9)(x-2)/(x-9)=lim(x-2)=9-2=7