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b = (34 cm - 2 * 8 cm - 2 * 7 cm) : 2 = (34 cm - 16 cm - 14 cm) : 2 = 4 cm : 2 = 2 cm
d = (30 dm - 2 * 3 dm - 2 * 7 dm) : 2 = (30 dm - 6 dm - 14 dm) : 2 = 10 dm : 2 = 5 dm
c = 30 dm - 2 * 7 dm - 3 dm - 5 dm = 30 dm - 14 dm - 3 dm - 5 dm = 8 dm Nie wiem czy o to zadanie chodziło