ياسين
11-06-2008, 07:36 PM
احسب المجماميع التالية حيث n عدد صحيح طبيعي:
\sum_{k=1}^n\:\frac{1}{k(k+1)(k+2)(k+3)}
\sum_{k=1}^\infty \:\frac{1}{k(k+1)(k+2)(k+3)}
\sum_{k=1}^n \:\frac{1}{k(k+1)(k+2)}
\sum_{k=1}^\infty \:\frac{1}{k(k+1)(k+2)}
\sum_{k=1}^n\:\frac{1}{k(k+1)(k+2)(k+3)}
\sum_{k=1}^\infty \:\frac{1}{k(k+1)(k+2)(k+3)}
\sum_{k=1}^n \:\frac{1}{k(k+1)(k+2)}
\sum_{k=1}^\infty \:\frac{1}{k(k+1)(k+2)}