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2 bok=4x
2×3x+2×4x=140m
6x+8x=140
14x=140
x=140:14
x=10
wymiary działki:
3x=3×10=30m
4x=4×10=40m
pole działki=30×40=1200m²
1ar=100m²
1m²=0,01a
1200m²=1200×0,01=12 arów ma działka
3x + 3x +4x + 4x = 140
14x = 140
x = 10
3x : 4x
30m : 40m
Wymiary działki: 30m x 40m
Pole = 30m x 40m = 1200m² = 12 arów
Odp: Działka ma 12 arów.