1/2+1/4+1/8+...+1/1024=1-1/1024 1/2+3/4+7/8+...+1023/1024=1-1/2+1-1/4+1-1/8+...+1-1/1024=10-(1-1/拦模1024)=9+1/兄衡者羡薯1024