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Mathematics for IGCSE & O level - Vectors (Section 3 - No. 19)
If a = [2, 1] and b = [-1, 3], what is the result of a - 2b?
[4, -5]
[4, -1]
[4, -7]
[4, 7]
解释
2b = [-2, 6]. a - 2b = [2 - (-2), 1 - 6] = [4, -5]
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