Câu 6:
Tìm giới hạn A=limx→+∞(x2+x+1−2x3+x−13)A=\lim\limits _{x \rightarrow+\infty}\left(\sqrt{x^{2}+x+1}-\sqrt[3]{2 x^{3}+x-1}\right)A=x→+∞lim(x2+x+1−32x3+x−1)
