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a)40*50*30=60.000cm3
b)2/3 z 30=20
40*50*20=40.000cm3=40l
60000 cm² = 600 dm²
600 dm² × ⅔ = 1200dm²/3 = 400dm²
²b ) 5 * 4 * 3 = 60 * ` dwie trzecie ` = 40 dm³
odp. wlano 40 l wody