math!!!!!!!!!!
回答 (2)
2008-02-24 3:15 am
2008-02-24 3:21 am
2-x <= 3x- 18
20 <=4x
5 <=x
(x-6)/3 <=3
x-6 <=9
x <=15
therefore , 5<= x <= 15
20 <=4x
5 <=x
(x-6)/3 <=3
x-6 <=9
x <=15
therefore , 5<= x <= 15
收錄日期: 2021-04-27 16:34:44
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https://hk.answers.yahoo.com/question/index?qid=20080223000051KK03401