(1)mn的值(2)m²+n²和(m+n)²的值.
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![(1)mn的值(2)m²+n²和(m+n)²的值.](/uploads/image/z/2586982-22-2.jpg?t=%EF%BC%881%EF%BC%89mn%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89m%26%23178%3B%2Bn%26%23178%3B%E5%92%8C%EF%BC%88m%2Bn%EF%BC%89%26%23178%3B%E7%9A%84%E5%80%BC.)
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(1)mn的值(2)m²+n²和(m+n)²的值.
(1)mn的值(2)m²+n²和(m+n)²的值.
(1)mn的值(2)m²+n²和(m+n)²的值.
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