1003187104

SubArea: 
Absolute value
Level: 
B
Project ID: 
1003187104
Accepted: 
1
Clonable: 
0
Easy: 
0
Let a be a positive real number. Then |x|≤a
if and only if −a≤x≤a.
if and only if x≤a.
if and only if x≥−a.
if and only if x<0.