(本題滿分10分)已知
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向量
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(1)當
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與
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平行時,求
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;
(2)當
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與
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垂直時,求
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.
(10分)解:由已知得
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4分
(1)由
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得
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; 7分
(2)由
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得
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
或
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. 10分
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