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2x + 2y = 80
x + y = 40
Zgodnie z rysunkiem i treścią zadania:
x + x + 20 = y-x + x + y
2x+20 = 2y
-2x+2y = 20
-x+y = 10
Układ równań:
x+y=40
-x+y=10
---------
2y=50
y=25
x=40-25=15
Pole: P = x*y = 15*25=375