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Completați cu numerele care lipsesc: a) 2 km = ☐ m = dm = cm = mm; b) km = 7 m = dm = cm = mm; c) km = m = 5 dm = cm mm; d) km = m = ☐ dm = 8 cm = mm: e) m = dm = cm = 9 mm; f) 4 mm = cm = dm = m: g) mm = 3 cm = dm = m; h) cm = dm = 7 m = km.​