Find ａ．ｂand the angle between ａ．ｂin each of the following.
ａ＋ｂ＝ｉ＋ｊ，ａ－ｂ＝ｉ－２ｊ
有條好易既a.maths vectors
2008-07-31 4:27 am
回答 (1)
2008-07-31 5:06 am
收錄日期: 2021-04-25 17:30:31
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https://hk.answers.yahoo.com/question/index?qid=20080730000051KK02965