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=6/7+56/15
=90+392/105
=482/105
(largo + ancho).2
reemplazo con los datos que me dan
(3/7 + 28/15)2 =
3 28 45 + 196 241
-- + ---- = -------------- = -----
7 15 105 105
241
------ x 2 = 482/105
105
el perímetro es de 482/105 km
saludos