1003187105

SubArea: 
Absolute value
Level: 
B
Project ID: 
1003187105
Accepted: 
1
Clonable: 
0
Easy: 
0
Let a be a positive real number. Then |x|≥a
if and only if x≥a or x≤−a.
if and only if x≥a.
if and only if x≤−a.
if and only if x>0.