解：E(X)=pD(X)=p(1-p)D(X拔)=D(X)/n=p(1-p)/nE(X拔)=E(x)=pE(X拔²)=D(X拔)+E(X拔)²=p(1-p)/n+p²E(S²)=σ²=D(x)=p(1-p)E(p)=E(X拔²)-E(S²/n)=p(1-p)/n+p²-p(1-p)/n=p²无偏得证如有意见，欢迎讨论，共同学习；如有帮助，请选为满意回答！
