写好拍下来给我吧
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写好拍下来给我吧写好拍下来给我吧 写好拍下来给我吧2x^2y^2-5xy+1=2(x^2y^2-5/2xy+1/2)=2[x^2y^2-5/2xy+(5/4)^2-(5/4)^2+1/2]=
写好拍下来给我吧
写好拍下来给我吧
写好拍下来给我吧
2x^2y^2-5xy+1=2(x^2y^2-5/2xy+1/2)=2[x^2y^2-5/2xy+(5/4)^2-(5/4)^2+1/2]=2[(xy-5/4)^2-(√17/4)^2]=2[xy-(5-√17)/4]*[xy-(5+√17)/4]