#ed_op#DIV#ed_cl# #ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#其實是可以計出0.999999999.....的#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#算式是~1)x=0.9999999.....#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# 2)10x=0.99999999....=9.9999999......#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# 3) 2-1)9.99999.....-0.999999......=9#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# 然後就是~~~ #ed_op#U#ed_cl#0.99999999#ed_op#/U#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# 9 |90#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# #ed_op#U#ed_cl# 81 #ed_op#/U#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# 90#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# #ed_op#U#ed_cl#81 #ed_op#/U#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl# #ed_op#U#ed_cl#如此類推#ed_op#/U#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#U#ed_cl#就能計出是0.9999.......了#ed_op#/U#ed_cl#^_^#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#U#ed_cl#可能有一點難看~但請將就一點~因為小弟不知道有沒有辦法弄出一個除數的直式-0-#ed_op#/U#ed_cl##ed_op#/DIV#ed_cl#kencch 寫到:再問一題:#ed_op#BR#ed_cl#0.111111111111.......=1/9#ed_op#BR#ed_cl#0.222222222222.......=2/9#ed_op#BR#ed_cl#0.333333333333.......=3/9#ed_op#BR#ed_cl#.#ed_op#BR#ed_cl#. #ed_op#BR#ed_cl#.#ed_op#BR#ed_cl#0.888888888888........=8/9#ed_op#BR#ed_cl#為什麼9/9=1而不是0.9999999999999...........