有條數唔識計
2011-03-03 7:50 am
回答 (1)
2011-03-03 8:08 am
✔ 最佳答案
5)(x² + 1)(x - 5) / (x² - 25) ≤ 0(x² + 1)(x - 5) / [(x - 5)(x + 5)] ≤ 0(x² + 1) / (x + 5) ≤ 0Since x² + 1 ≥ 1 ,so (x + 5) < 0i.e. x < - 5
收錄日期: 2021-04-21 22:19:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110302000051KK01618