phép trừ (qua 10) trong phạm vi 20

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11-2 11-6. 11-3. 11-7. 11-4. 11-8 11-5 11-9

9. 4. 7. 3. 6 2. 5 2

11-2 11-6. 11-3. 11-7. 11-4. 11-8 11-5 11-9

9. 4. 7. 3. 6 2. 5 2

11-2 11-6. 11-3. 11-7. 11-4. 11-8 11-5 11-9

9. 4. 7. 3. 6 2. 5 2

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