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1/m +1/n = 4/7
(m+n) / (mn) = 4/ 7
misal (m+n) = 4a
dan (mn) = 7a
..
m²+n² = ((m+n)² - 2 (mn)
m²+n² = (4a)² - 2(7a) = 16a² -14a
..