1) Tìm các giới hạn sau:
$a/ \mathop {\lim }\limits_{x \to +\infty}\frac{(2x-1)^5.(3x^2+1)^4}{(3x^2+x+1)^3.(2x+3)^7}$
$b/ \mathop {\lim }\limits_{x \to -\infty}\frac{(2x-3)^{2010}.(5-3x^2)}{(4x^3+2).(11-2x)^{2009}} $

gọi cái cần tính $lim$ là $u_n$ nhé


$b)limu_n=lim\frac{(2-\frac{3}x)^{2010}(\frac{5}{x^2}-3)}{(4+\frac{2}{x^3})(\frac{11}{x}-2)^{2009}}=\frac{2.(-3)}{4(-2)}=\frac{3}{4}$

gọi cái cần tính $lim$ là $u_n$ cho dễ nhé. :P


$a)limu_n=lim\frac{(2-\frac{1}{x})^5(3+\frac{1}{x^2})^4}{(3+\frac{1}x+\frac{1}{x^2})^3(2+\frac{3}x)^7}=\frac{2.3}{3.2}=1$

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