Răspuns :
m + n = 280
m - n = 180
m = 180 + n
180 + n + n = 280
2 n = 280 - 180
2n = 100
n = 100 : 2
n = 50
m = 180 + 50 = 230
230 + 50 = 280
230 - 50 = 180
m - n = 180
m = 180 + n
180 + n + n = 280
2 n = 280 - 180
2n = 100
n = 100 : 2
n = 50
m = 180 + 50 = 230
230 + 50 = 280
230 - 50 = 180