考慮下面2條題目::
1. 〡x^2 - 2x - 2〡 = 1
2. 〡x - 7〡 = 2x + 1
點解題目唔洗分case就直接::
x^2 - 2x - 2 = 1 or x^2 - 2x - 2 = -1
但題目2就要分case::
when x<7 and when x> 7
收錄日期: 2021-04-13 16:36:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090501000051KK01591