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若向量e1與e2不共線,向量a=-e1+ke2,b=ke1-e2 a平行與向量b 那麼a=λb 所以-e1+ke2=λke1-λe2 所以λk=-1,k=-λ 故k²;=1 k=±1 如果不懂,請Hi我,祝學習愉快!
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