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高一下新教材5.3节有这样一道例题: 如图, 不共线, t∈R,用表示 . 例题推得这样一条结论:
There is such an example in Section 5.3 of the New Textbook: As shown in the figure, it is not collinear, t∈R, and the example is used to derive such a conclusion: