Find a ⋅ b. a = 9i + 5j, b = 4i + 3j please help. super lost.?
回答 (3)
2019-01-26 6:42 am
✔ 最佳答案
a . b =9 * 4 + 5 * 3 =
36 + 15 =
51
2019-01-26 4:52 pm
a = 9i + 5j
b = 4i + 3j
a.b = (9i + 5j) (4i + 3j)
(i.i = 1, j.j = 1),
a.b = (9 x 4)I + (5 x 3)j
a.b = 36i + 15j.
b = 4i + 3j
a.b = (9i + 5j) (4i + 3j)
(i.i = 1, j.j = 1),
a.b = (9 x 4)I + (5 x 3)j
a.b = 36i + 15j.
2019-01-26 6:07 am
a • b = 36 + 15
a • b = 51
a • b = 51
收錄日期: 2021-05-01 22:16:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20190125205600AAJVDAW