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P=800m*350m
P=280 000m²
1ha=10 000m²
280 000m²=28ha
28*20t=560t
odp.pan Adam zebrał 560 ton ziemniaków
P=800x350=280000m2
280000m2=28 ha
20 tonx28 = 560 ton
Odp.Pan Adam zebrać z pola tego prostokąta 560 ton ziemniaków.