Given the square of M - 7m + 2 = 0, the square of Nd - 7n + 2 = 0, find n / M + m / N =?
When m ≠ n, it shows that m and N are two solutions of the equation x ^ 2-7x + 2 = 0, then M + n = 7, m × n = 2, then n / M + m / N = 7 / 2
When m = n, N / M + m / N = 2
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