3,|x+¼|

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3,|x+¼|3,|x+¼|3,|x+¼||x+¼|≤½-½≤x+¼≤½-½-¼≤x≤½-

3,|x+¼|
3,|x+¼|

3,|x+¼|
|x+¼|≤½
-½≤x+¼≤½
-½-¼≤x≤½-¼
-3/4≤x≤¼
答案:-3/4≤x≤¼

-3/4<=1/4

①x+1/4<=1/2
x<=1/2-1/4=1/4
x<=1/4
②-(x+1/4)<=1/2
-x-1/4<=1/2
-x<=3/4
x>=-3/4
∴-3/4<=x<=1/4