Cho $m,n$ nguyên dương hãy tính $T=\sum_{k=0}^m \frac{C_{n+k}^k}{2^{m+k}}+\sum_{k=0}^m \frac{C_{m+k}^k}{2^{n+k}}$
$T=\sum_{k=0}^m \frac{C_{n+k}^k}{2^{m+k}}+\sum_{k=0}^m \frac{C_{m+k}^k}{2^{n+k}}$
Started By I Love MC, 07-09-2016 - 16:45
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Posted 07-09-2016 - 16:45
I Love MC
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