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20以内连减

20-9-8=

10-2-0=

18-9-1=

11-0-3=

9-2-6=

18-9-4=

19-3-10=

19-14-5=

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11-7-0=

3-0-0=

14-2-10=

20-18-2=

18-1-17=

11-1-4=

8-5-0=

16-2-4=

13-3-9=

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15-3-11=

17-3-5=

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14-4-0=

15-11-3=

13-9-1=

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16-1-3=

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19-1-5=

18-7-0=

18-2-11=

2-1-0=

12-1-4=

3-1-0=

14-9-1=

16-9-5=

20-13-7=

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20-0-19=

17-0-2=

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