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(2/m)+(4/n)＝1
両辺にmnをかけて
2n+4m＝mn
mn−2n−4m＝0
(m−2)(n−4)＝8
(m−2,n−4)＝(±1,±8)(±2,±4)(±4,±2)(±8,±1)
m>0,n>0より
(m,n)＝(3,12),(4,8),(6,6),(10,5)
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