已知x+y=7,xy=2则x²+y²的值为多少?
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![已知x+y=7,xy=2则x²+y²的值为多少?](/uploads/image/z/12955263-15-3.jpg?t=%E5%B7%B2%E7%9F%A5x%EF%BC%8By%EF%BC%9D7%2Cxy%EF%BC%9D2%E5%88%99x%26%23178%3B%EF%BC%8By%26%23178%3B%E7%9A%84%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
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