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a = 1dm = 10cm
Op = 3 * 10cm
Op = 30cm
60cm – 30cm = 30cm
b = 30cm : 3
b = 10cm
b . a= 2 mm
100 razy 2 = 200 = 20 cm
60 cm - 20 cm = 40
40 : 100 = 0, 4