Số ?
2dm = ...cm
3dm = ....cm
5dm = ...cm
9dm = ...cm
20cm = ...dm
30cm = ...dm
50cm = ...dm
90cm = ...dm
2dm = 20cm
3dm = 30cm
5dm = 50cm
9dm = 90cm
20cm = 2dm
30cm = 3dm
50cm = 5dm
90cm = 9dm
-- Mod Toán 2
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