Tính các giới hạn:
1) lim\frac{\sqrt[3]{4x}-2}{x-2} 2) \mathop {\lim }\limits_{x \to 0}\frac{\sqrt[3]{1-x}-1}{x} 3) \mathop {\lim }\limits_{x \to 1}\frac{\sqrt[3]{x}-1}{\sqrt[3]{x-2}+1}
4) \mathop {\lim }\limits_{x \to 1} \frac{\sqrt[3]{2x-1}-\sqrt[3]{x}}{\sqrt{x}-1} 5) \mathop {\lim }\limits_{x \to 0}\frac{\sqrt[3]{x-1}+\sqrt[3]{x+1}}{\sqrt{2x+1}-\sqrt{x+1}}
6) \mathop {\lim }\limits_{x \to -1}\frac{\sqrt[3]{x}+x^2+x1}{x+1} 7) \mathop {\lim }\limits_{x \to 8}\frac{\sqrt{9+2x}-5}{\sqrt[3]{x}-2}
8) \mathop {\lim }\limits_{x \to 0}\frac{\sqrt[n]{1+x}-1}{x} 9) \mathop {\lim }\limits_{x \to 1} \frac{\sqrt[m]{x}-1}{\sqrt[n]{x}-1}