爱上海后花园

1+1\2+3\4+7\8+15\16+31\32+63\64+127\128等于多少?急用!

111\\211\\411\\811\\1611\\3211\\6411\\128181\\21\\41\\12881\\21\\41\\1281\\1281\\12881\\21\\41\\641\\641\\12881\\21\\21\\128811\\12871\\12871281...

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