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∑n=199991(n+n+1)(n4+n+14)= ? \large \sum_{n=1}^{9999}{\dfrac{1}{(\sqrt{n}+\sqrt{n+1})(\sqrt[4]{n}+\sqrt[4]{n+1})}}= \ ? \ n=1∑9999(n+n+1)(4n+4n+1)1= ?
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