✔ 最佳答案
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圖片參考:
http://img225.imageshack.us/img225/5595/64958539.png
2010-08-29 21:18:09 補充:
http://img225.imageshack.us/img225/5595/64958539.png
2010-08-30 08:58:01 補充:
C:你是誤會了吧!一星期y單位的草,一天是y/7單位的草,一小時是y/168單位的草...
2010-08-30 11:31:58 補充:
是一時大意寫錯了:
648z=15nz=>n=43.2
應該是43頭牛