2x^2+xy-y^2-4x+8y-6
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2x^2+xy-y^2-4x+8y-62x^2+xy-y^2-4x+8y-62x^2+xy-y^2-4x+8y-6应该把6改为16,则可得(2x-y+4)(x+y-4),把上式等于0,把x作为未知数,
2x^2+xy-y^2-4x+8y-6
2x^2+xy-y^2-4x+8y-6
2x^2+xy-y^2-4x+8y-6
应该把6改为16,则可得(2x-y+4)(x+y-4),把上式等于0,把x作为未知数,Δ若为完全平方式的话,常数项必须为16,这样就很容易得到了
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