Maths problem: how to do, thanks?
回答 (1)
2020-09-14 9:34 pm
✔ 最佳答案
(x+p)(2x+q) = 2x^2+(2p+q)x+pq= 2x^2-5x+a
∴ 2p+q = -5 , pq = a > 0
∴ p < 0, q < 0
I. p = -1, q = -3 可.
II. p = -2, q = -1 可.
III. p = -3, q = 1 不符.
正確選項: C.
收錄日期: 2021-04-24 07:59:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200914114440AAjtZSd