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a. Vì ) nằm trên tia đối tia AB => A nằm giữa O và B
=> \(OA+AB=OB\)
=> \(OA< OB\)
b. Trong 3 điểm O, M, N thì M nằm giữa hai điểm còn lại vì:
\(OA< OB\Rightarrow\frac{OA}{2}< \frac{OB}{2}\)
=> \(OM< ON\)
=> O nằm giữa hai điểm còn lại
c. \(MN=ON-OM\)
\(=\frac{AB}{2}-\frac{OA}{2}\)
\(=\frac{AB}{2}\)
=> MN không phụ thuộc vào vị trí của điểm O
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