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求第七题详细过程
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a = (5, -5), b = (-6, -3), c = (1, 8)
3a+b-3c = (15, -15) + (-6, -3) - (3, 24) = (6, -42)
mb+nc = (-6m + n, -3m + 8n) = (5, -5)
-6m + n = 5
-3m + 8n = -5
解出m = n = -1
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a = (5, -5), b = (-6, -3), c = (1, 8)
3a+b-3c = (15, -15) + (-6, -3) - (3, 24) = (6, -42)
mb+nc = (-6m + n, -3m + 8n) = (5, -5)
-6m + n = 5
-3m + 8n = -5
解出m = n = -1
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