1/ \(\lim\limits_{x\rightarrow1}f\left(x\right)=\lim\limits_{x\rightarrow1}\dfrac{\left(x-2\right)\left(x^2+2x+4\right)}{x-2}=7\ne f\left(1\right)=5\)
=> Ham so bi gian doan tai x=1
2/ \(\lim\limits_{x\rightarrow3}f\left(x\right)=\lim\limits_{x\rightarrow3}\dfrac{4-x-1}{\left(3-x\right)\left(2+\sqrt{x+1}\right)}=\dfrac{1}{4}\ne f\left(3\right)=4\)
=> Ham so bi gian doan tai x=3
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