有條好易既a.maths vectors

👨🏻‍🏫 學術台數學

2008-07-31 4:27 am

Find ａ．ｂand the angle between ａ．ｂin each of the following.

ａ＋ｂ＝ｉ＋ｊ，ａ－ｂ＝ｉ－２ｊ

回答 (1)

2008-07-31 5:06 am

✔ 最佳答案

The solution is as follows:

圖片參考：http://hk.geocities.com/stevieg_1023/vector.gif

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