将x=6-y代入z²=xy-9,得z²=-y²+6y-9,简化得z²=-(y-3)²,只有当y-3=0时方程式成立,因此y=3,将y=3代入x=6-y,得x=3 ,所以x=y
已知实数x,y,z满足x=6-y,z2=xy-9,求证:x=y.
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