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x+13=numero del medio
x=numero menor
x+x+13+x+28=257
x+x+x+13+28=257
3x+41=257
3x=257-41
3x=216
x=216/3
x=72
entonces:
x=72
x+13.........72+13=85
x+28.........72+28=100
los numeros serian: 100 , 85 , 72