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Trecho 2 = m
Resolvemos :
m + 12 + m = 48
m + m + 12 = 48
2m + 12 = 48
2m = 48 - 12
2m = 36
m = 36/2
m = 18
m + 12 = 18 + 12 = 30
Solución :
La longitud del 1 es = 30
La longitud del 2 es = 18