1, \lim_{x\rightarrow 1} \frac{\sqrt[3]{x+2}+x^{^{2}}+2x }{\sqrt{x}-1}
2, \lim_{x\rightarrow 0} \frac{\sqrt{1+2x}-\sqrt[3]{1+3x}}{x^{2}}
3, \lim_{x\rightarrow 0} \frac{\sqrt{1+x^{2}}-cos x}{x^{2}}
4, \lim_{x\rightarrow 0} \frac{\sqrt{5x^{3}+x^{2}+6x+9}-\sqrt[3]{9x^{2}+27x+27}}{x^{2}}
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