3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5 （1）方法

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3≤|8-x||x+1|>2-x|x+3|7|x+1|x^2-6|x|+9>0|x-1|+|x+2|≥5（1）方法3≤|8-x||x+1|>2-x|x+3|7|x+1|x^2-6|x|+9>0|x-1

3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5 （1）方法
3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5
（1）方法

3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5 （1）方法
3≤|8-x|
平方得：
x^2-16x+55≥0
(x-5)(x-11)≥0
x≥11,x≤5
|x+1|>2-x 分类
当x>-1时,x+1>2-x,x>1/2
当x1/2
|x+3|

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