Điền dấu > , < , =
1dm....10cm
1dm....8cm
1dm....15cm
1dm + 1dm.....10cm + 8cm
1dm + 1dm.....10cm + 12cm
2dm.....10cm + 10cm
1dm = 10cm
1dm > 8cm
1dm < 15cm
1dm + 1dm > 10cm + 8cm
1dm + 1dm < 10cm + 12cm
2dm = 10cm + 10cm
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