求助戰友

hijenny · 发表于 2010-7-28 05:20:57

55.6892-!-item-!-187;#058&005291

Which of the following inequalities has a solution set that, when graphed on the number line, is a single line segment of finite length?

(A)X⁴≧ 1

(B)X³≦ 27

(C)X²≧ 16

(D)2 ≦ |X| ≦ 5

(E)2 ≦ 3X + 4 ≦ 6

為什麼D不行阿?
懇請賜教

hijenny · 发表于 2010-7-28 05:21:31

答案是E

christinabai · 发表于 2010-7-28 05:23:21

因为还有x<0的情况。“single line”

hijenny · 发表于 2010-7-28 05:29:24

single line 是甚麼??

hijenny · 发表于 2010-7-29 05:58:18

是不是指單向阿?

求助戰友

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