回復 1# thankyou 的帖子
\(\frac{C_{0}^{6}\times \left( {{2}^{6}}-1 \right)+C_{1}^{6}\times {{2}^{5}}+C_{2}^{6}\times {{2}^{4}}+C_{3}^{6}\times {{2}^{3}}+C_{4}^{6}\times {{2}^{2}}+C_{5}^{6}\times 2+C_{6}^{6}\times 1}{{{2}^{6}}\times \left( {{2}^{6}}-1 \right)}\)
