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設這個公共根為α.則方程x2-4x+k=0的兩根為α、4-α;方程x2-x-2k=0的兩根為α、1-α.由根與係數的關係有: ;α(4−α)=kα(1−α)=2k;.解得α=0k=0或α=7k=−21.所以當k=0或-21時,兩個方程有一個公共根.故答案是:0或-21.
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