完全平方。
x2+(x-2)2+2x+k=0,
x2+x2-4x+4+2x+k=0
2x2-2x+4+k=0
2(x-1/2)2+4+k-1/4=0
当4+k-1/4=0时,X有唯一解。K=-15/4
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