Maths唔識抵死題(QUICK!!!!!!!!!!!!)
2010-10-24 4:39 am
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DO IT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! QUICK
回答 (2)
2010-10-24 4:59 am
✔ 最佳答案
(a+bi)(2+i) - a + bi = 12i2a + (a+2b)i - b - a + bi = 12i
a - b + (a+3b)i = 12i
So a - b = 0 => a = b
a + 3b = 12
4b = 12
b = 3
So a =3
z = 3 + 3i
參考: me
2010-10-24 5:28 am
(a+bi)(2+i) - a + bi = 12i
2a + (a+2b)i - b - a + bi = 12i
a - b + (a+3b)i = 12i
So that a - b = 0 => a = b
a + 3b = 12
4b = 12
b = 3
So that a =3
z = 3 + 3i
2a + (a+2b)i - b - a + bi = 12i
a - b + (a+3b)i = 12i
So that a - b = 0 => a = b
a + 3b = 12
4b = 12
b = 3
So that a =3
z = 3 + 3i
參考: me
收錄日期: 2021-04-13 17:35:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101023000051KK03027