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Mathematics for IGCSE & O level - Vectors (Section 4 - No. 13)

Given that OA = a and OB = b and M is the midpoint of AB. What vector represents OM?
a + b
b - a
1/2(a + b)
1/2(b - a)

解释

OM = OA + AM, and AM = 1/2 AB = 1/2 (OB-OA).

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