Question

怎么解(5-x)(x+4)大于等于0 (x+2)\(3x+4)小于0 (2x+3)\(x-1)大于等于0

都不知道为什么错了!求各位天才帮我解答!

Answer 1

(5-x)(x+4)大于等于0
(x-5)(x+4)<=0
-4<=x<=5

(x+2)\(3x+4)小于0
等价于(x+2)(3x+4)<0
-2<x<-4/3

(2x+3)\(x-1)大塌岩此于等于0
等团迅价枣毁于(2x+3)(x-1)>=0且x-1不等于0
∴x>1或x<=-3/2

Answer 2

(5-x)(x+4)≥颤运0
(x-5)(x+4)≤0
-4≤ x≤轮胡5

(x+2)\(3x+4)＜0
(x+2)(3x+4)＜0
-2＜腊洞拦x＜-4/3

(2x+3)\(x-1)＞0
(2x+3)(x-1)＞0
x＞1或x＜-3/2