A:H2O═H2↑+O2↑
B:2H2O 通电__ 2H2↑+O2↑
C:H2O2═2H2+O2
D:H2O 通电__ 2H2↑+2O↑
In April, 2009, President Hu inspected the warships in Qingdao, ______ the 60th anniversary of the founding of the PLA Navy.
(Ⅰ)试推导{an}的前n项和公式;
(Ⅱ) 设q≠1,证明数列{an+1}不是等比数列.