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因為(k-4)x+(k-2)x+(k+3)y=k+1是關於xy的二元一次方程所以二次項的係數肯定為0即:k-4=0所以k=±2但是當k=2時,x前面的係數k-2就等於0了,這樣原式就變成一元一次方程了,所以k≠2所以k=-2
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