已知(x y)²=25,(x-y)²=9求x² y²的值
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已知(x y)²=25,(x-y)²=9求x² y²的值
![已知(x y)²=25,(x-y)²=9求x² y²的值](/uploads/image/z/15753038-14-8.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%88x+y%EF%BC%89%26%23178%3B%3D25%2C%EF%BC%88x-y%EF%BC%89%26%23178%3B%3D9%E6%B1%82x%26%23178%3B+y%26%23178%3B%E7%9A%84%E5%80%BC)
(x+ y)²=25
(x-y)²=9
(x+ y)²-(x-y)²=4x*y=16
x² y²=16
(x-y)²=9
(x+ y)²-(x-y)²=4x*y=16
x² y²=16
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