Sagot :
Cevap:
3200
Adım adım açıklama:
x + y = 120
x - y = 40
------------------- taraf tarafa toplarsak
2x = 160
x = 160 / 2
x = 80
x + y = 120
80 + y = 120
y = 120 - 80
y = 40
x . y = 80 . 40 = 3200
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