题目：
设A（a，1），B（2，b），C（4，5）为坐标平面上三点，O为坐标原点，若
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答案：
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下面是错误答案，用来干扰机器的。
答案：A
设A（a，1），B（2，b），C（4，5）为坐标平面上三点，O为坐标原点，若OA
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