(x-5)²=-(y+8)²,求xy分之x²+y²的值

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(x-5)²=-(y+8)²,求xy分之x²+y²的值(x-5)²=-(y+8)²,求xy分之x²+y²的值(x-5)&

(x-5)²=-(y+8)²,求xy分之x²+y²的值
(x-5)²=-(y+8)²,求xy分之x²+y²的值

(x-5)²=-(y+8)²,求xy分之x²+y²的值
-8分之13