求AB的slope,我唔知係2/50定係50/2..
圖片參考:http://imgcld.yimg.com/8/n/HA05329604/o/701105030104513873434020.jpg
收錄日期: 2021-04-13 17:58:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110503000051KK01045