(x²＋y²)/(x－y)
=[(x－y)²＋2xy]/(x－y)
=(x－y)＋4/(x－y) ====>>>> 因x－y大于等于0,则可以利用基本不等式证明
>=4
x>y>o xy=2 求证 (x2+y2)除以x-y大于等于4
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