m + n = 2/p ………………………………………①mn = -1 ……………………………………………②1/n - 1/m =│4/p│………………………………③由①得(m+n)^2 = 4/p^2m^2 + 2mn + n^2 = 4/p^2将②代入上式得m^2 + n^2 ...