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When (M + n) ^ 2 + 595 is the minimum, m ^ 2-N ^ 2 = (), | 2m | - | 2n|= When (M + n) ^ 2 + 595 is the minimum, m^2-n^2= |2m|-|2n|=
When the minimum value is removed, M = - n
m^2-n^2=0
|2m|-|2n|=0
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