大雄打算以8元向無牌小販購買一包三文治或一碗麵。若在麵湯裏發現一隻蟑螂，解釋這對大雄購買三文治的機會成本有什麼影響。 by HO BO SHAN https://padlet.com/hbs1/xev73u3l8f66 （3分） en-us 2017-09-10 06:36:11 UTC 2023-02-13 07:07:14 UTC hello@padlet.com s20141034 https://padlet.com/hbs1/xev73u3l8f66/wish/186229233 2017-09-11 03:35:25 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186229233 s20131094 https://padlet.com/hbs1/xev73u3l8f66/wish/186229330 2017-09-11 03:36:15 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186229330 s20141034 https://padlet.com/hbs1/xev73u3l8f66/wish/186229611 2017-09-11 03:38:38 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186229611 https://padlet.com/hbs1/xev73u3l8f66/wish/186229618 2017-09-11 03:38:42 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186229618 https://padlet.com/hbs1/xev73u3l8f66/wish/186229642 2017-09-11 03:38:54 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186229642 s20141005 https://padlet.com/hbs1/xev73u3l8f66/wish/186229762 2017-09-11 03:40:08 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186229762 https://padlet.com/hbs1/xev73u3l8f66/wish/186230563 2017-09-11 03:46:41 UTC https://padlet.com/hbs1/xev73u3l8f66/wish/186230563