已知(x+y)²=25,(x-y)²=9求xy与x²+y²的值
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已知(x+y)²=25,(x-y)²=9求xy与x²+y²的值
已知(x+y)²=25,(x-y)²=9求xy与x²+y²的值
已知(x+y)²=25,(x-y)²=9求xy与x²+y²的值