x－y＋1＝0y=x+1代入x²/16＋y²/4＝1x²/16＋(x+1)²/4＝1x²＋4(x+1)²＝165x²+8x-12=0根据韦达定理：x1+x2=-8/5,x1x2=-2/5(x2-x1)² = (x2+x1)² -4x1x2 = (8/5)²+412...