#mathhistoryUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesSteemit FeedbackNewcomers' CommunitySteemitCryptoAcademyআমার বাংলা ব্লগKorea • 한국 • KR • KOSTEEM CN/中文Steem POD TeamAVLE 일상Tron Fan ClubWORLD OF XPILARBeauty of CreativitySteem Alliance#mathhistoryTrendingHotNewPayoutsMutedxaviorfx (32)in #mathhistory • 7 years ago11-181728 - 828 = 900