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calculează : 5km+5hm=? m, 44m+5cm= ?cm, 6m+18dm= ? mm, 6hm+5dam= ?m, 570m- 1600dm=? cm, 9km-9hm=?dam, 21km-18dam=?dm, 630cm-120mm=? mm, 50km-5000m=?I'm, 560hm-500m=?hm, 2000mm-100cm=?m.​