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a) Tính \mathop {\lim }\limits_{} \left ( \frac{1}{n+1}+\frac{1}{n+2}+..+\frac{1}{n+n}\right )
b)
Tính \mathop {\lim }\limits_{} \left ( \frac{\sqrt[n]{2}
}{n+1}+\frac{\sqrt[n]{2^2} }{n+\frac{1}{2} }+...+\frac{\sqrt[n]{2^n}
}{n+\frac{1}{n} }\right ) .
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