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Segundo número = n
m + n = 555
m - n = 125
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2m + 0n = 680
2m = 680
m = 680/2
m = 340
Reemplazo m en 1
m + n = 555
340 + n = 555
n = 555 - 340
n = 215
Solución : Los números son : 215 y 340
A+B= 555 ........ I
A-B= 125 .........II
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2A = 680
A = 340 ...... III
III en I
A+B = 555
340 + B = 555
B= 555-340
B = 215