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czyli ziemniaki = 3/6
2/6 + 3/6 = 5/6
1/6 = uprawa ogórków
W-1/3
O-x
O= 1- (1/2+1/3)
O= 1- (3/6+2/6)
O= 1/6
odp.C
⅓ - włoszczyzna
½ + ⅓ = ³/₆ + ²/₆ = ⅚
1 - ⅚ = ⁶/₆ - ⅚ = ⅙ - ogórki
odpowiedź c