-2x²+x+2小過等於0

2011-06-06 3:03 am
-2x²+x+2小過等於0
用配方法點計?!

回答 (2)

2011-06-06 4:13 am
2011-06-06 4:52 am
-2x²+x+2=-(x-2)(x+1) <=0
=> (x-2)(x+1)>=0

x<=-1 or x >=2


收錄日期: 2021-04-23 22:04:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110605000051KK00766

檢視 Wayback Machine 備份