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1、改錯： 20 以內(nèi)退位減法 13-9= 15-8= 14-7= 14-8= 11-3= 11-6= 13-7= 13-4= 16-9= 18-9= 13-9= 12-3= 12-4= 12-8= 15-6= 14-8= 11-8= 14-5= 11-9= 11-4= 13-6= 11-7= 11-8= 15-7= 12-5= 16-8= 12-8= 12-5= 11-6= 11-5= 11-3= 12-3= 11-8= 17-8= 12-4= 12-9= 15-8= 14-9= 16-7= 12-8= 16-7= 15-7= 14-5= 14-7= 14-7= 12-8= 14-7= 14-8

2、= 12-8= 17-8= 15-8= 11-4= 17-8= 11-3= 17-9= 13-7= 12-5= 15-8= 12-8= 18-9= 11-6= 12-5= 11-9= 16-8= 13-6= 16-9= 12-6= 13-9= 14-5= 14-6= 13-4= 16-7= 16-7= 13-4= 12-6= 11-7= 13-6= 16-8= 12-6= 11-9= 14-7= 12-6= 16-9= 14-9= 14-6= 11-9= 15-9= 11-8= 16-9= 13-6= 13-8= 18-9= 11-5= 12-9= 14-7= 15-6= 16-9= 17-9

3、= 11-9= 12-9= 改錯： 20 以內(nèi)退位減法 12-3= 17-8= 14-6= 13-7= 14-9= 11-7= 18-9= 16-9= 11-5= 12-8= 13-8= 13-8= 12-8= 11-3= 11-6= 11-9= 14-9= 11-7= 11-5= 12-3= 11-8= 14-9= 18-9= 12-6= 16-7= 17-8= 13-4= 11-5= 13-7= 12-6= 12-8= 12-8= 14-5= 11-7= 13-5= 15-7= 18-9= 13-9= 14-8= 13-9= 11-5= 17-9= 11-5= 15-8= 15-9= 18

4、-9= 13-8= 11-6= 11-3= 16-7= 16-8= 11-4= 13-6= 13-4= 13-6= 12-5= 14-8= 13-9= 12-5= 11-9= 11-2= 11-3= 14-9= 13-6= 16-7= 15-7= 15-8= 15-6= 17-8= 15-9= 11-2= 15-7= 12-3= 11-4= 14-6= 12-9= 12-6= 15-6= 12-9= 15-8= 11-9= 11-7= 15-6= 11-7= 14-9= 13-5= 14-6= 12-4= 13-5= 16-7= 15-9= 13-5= 16-7= 14-7= 11-5= 12

5、-9= 13-5= 12-5= 11-7= 15-9= 改錯： 20 以內(nèi)退位減法 14-5= 12-5= 13-9= 11-6= 15-8= 15-9= 16-8= 13-9= 13-8= 15-8= 14-8= 12-8= 15-8= 16-7= 12-9= 15-8= 14-9= 16-9= 11-9= 17-9= 14-9= 16-8= 11-9= 11-9= 13-4= 12-3= 12-6= 17-9= 11-7= 12-5= 12-6= 11-5= 12-3= 11-5= 12-4= 15-9= 14-6= 14-9= 11-2= 16-8= 16-8= 14-9= 13-9=

6、13-9= 13-4= 12-4= 15-9= 13-4= 15-6= 13-8= 14-9= 11-3= 13-7= 12-3= 12-5= 13-4= 15-8= 13-5= 12-9= 11-7= 11-7= 14-5= 12-8= 16-8= 11-4= 13-7= 15-6= 11-8= 11-3= 12-5= 14-9= 14-6= 11-7= 12-8= 12-6= 13-7= 15-9= 11-8= 11-2= 16-8= 14-8= 15-9= 12-6= 13-8= 14-7= 14-6= 13-7= 16-7= 13-7= 16-8= 15-8= 14-9= 15-8=

7、13-8= 14-6= 12-5= 14-9= 11-7= 17-9= 16-7= 改錯： 20 以內(nèi)退位減法 14-6= 13-6= 15-7= 11-6= 13-7= 11-5= 12-7= 15-9= 14-9= 14-7= 17-9= 11-9= 15-7= 14-8= 13-5= 13-5= 11-7= 12-7= 13-9= 11-8= 16-7= 17-9= 11-8= 13-8= 11-3= 16-7= 14-9= 12-5= 16-7= 13-5= 11-6= 15-9= 11-5= 12-6= 16-7= 11-3= 17-8= 11-8= 14-6= 18-9= 12-8

8、= 12-5= 14-6= 13-4= 16-7= 11-5= 13-9= 11-9= 13-5= 15-8= 16-9= 15-8= 17-8= 11-8= 11-8= 11-7= 14-7= 13-4= 11-3= 15-9= 12-3= 12-8= 11-3= 14-5= 13-9= 16-7= 11-5= 14-9= 15-9= 12-9= 15-7= 11-7= 11-8= 15-8= 14-8= 17-9= 11-6= 16-9= 11-3= 15-7= 16-9= 15-8= 12-7= 16-7= 13-7= 12-3= 12-4= 12-3= 11-2= 15-8= 12-5

9、= 11-6= 14-7= 16-9= 17-8= 15-8= 12-6= 18-9= 12-7= 11-4= 改錯： 20 以內(nèi)退位減法 11-6= 12-6= 13-9= 14-5= 14-6= 15-8= 14-6= 16-8= 14-9= 11-3= 13-5= 12-3= 12-4= 11-9= 14-9= 13-6= 13-5= 14-9= 12-5= 12-8= 13-5= 14-7= 14-6= 11-5= 11-8= 13-8= 11-9= 16-7= 15-7= 13-9= 16-9= 14-9= 11-7= 12-8= 16-8= 14-7= 11-7= 11-4= 12

10、-6= 15-7= 12-9= 14-8= 15-9= 13-6= 17-9= 11-7= 11-3= 12-9= 11-5= 14-8= 11-4= 13-6= 11-9= 12-6= 12-8= 16-7= 12-9= 11-8= 14-7= 14-6= 12-4= 12-4= 11-7= 12-5= 13-6= 13-7= 12-3= 14-6= 15-9= 11-6= 16-7= 13-6= 12-6= 11-7= 12-5= 14-7= 15-8= 12-7= 16-7= 12-3= 13-8= 12-9= 16-7= 14-5= 13-6= 13-5= 12-4= 17-9= 15

11、-6= 11-6= 16-8= 12-5= 11-9= 17-9= 11-5= 14-9= 13-9= 11-7= 14-5= 12-5= 改錯： 20 以內(nèi)退位減法 11-9= 17-8= 11-4= 14-7= 13-8= 13-8= 12-8= 14-9= 16-9= 12-3= 14-5= 13-7= 16-8= 16-9= 14-9= 12-4= 14-8= 15-9= 13-6= 14-8= 15-8= 18-9= 12-8= 13-8= 14-7= 16-8= 14-5= 12-9= 13-6= 13-8= 13-8= 16-9= 14-5= 15-8= 13-5= 14-8=

12、13-4= 13-4= 14-5= 12-3= 13-9= 12-3= 13-9= 11-8= 13-7= 17-8= 11-6= 12-9= 11-6= 12-6= 12-7= 13-6= 16-7= 11-6= 14-5= 12-8= 13-9= 15-8= 14-9= 13-9= 12-5= 14-9= 14-8= 17-9= 12-8= 12-9= 13-5= 16-9= 12-9= 12-3= 13-7= 11-7= 13-7= 12-5= 11-7= 14-6= 17-8= 13-6= 17-9= 15-8= 13-6= 14-7= 15-7= 13-7= 13-8= 11-2=

13、15-9= 16-7= 17-9= 15-9= 16-8= 11-9= 11-5= 13-8= 17-9= 11-8= 12-9= 14-8= 11-6= 16-8= 改錯： 20 以內(nèi)退位減法 13-4= 12-9= 12-4= 15-8= 11-2= 13-8= 15-6= 12-7= 12-8= 14-8= 12-4= 13-8= 13-5= 14-8= 14-5= 12-6= 15-9= 12-6= 11-8= 12-4= 15-8= 11-3= 12-5= 12-7= 14-9= 11-5= 16-7= 12-9= 12-8= 17-8= 11-4= 12-3= 11-3= 15-9

14、= 15-7= 17-8= 12-7= 11-9= 12-4= 17-8= 14-5= 12-3= 11-4= 12-5= 12-9= 11-8= 12-9= 12-7= 12-6= 13-4= 16-9= 13-5= 11-7= 12-7= 14-6= 13-4= 11-9= 15-6= 16-7= 17-8= 13-7= 12-3= 12-4= 13-4= 12-5= 13-8= 12-4= 14-6= 16-8= 11-9= 13-4= 11-3= 11-4= 11-4= 12-7= 11-9= 17-9= 12-3= 13-7= 17-8= 11-2= 12-6= 17-8= 15-7

15、= 14-5= 15-9= 12-6= 12-9= 11-7= 11-7= 13-5= 12-9= 16-7= 13-5= 11-9= 14-8= 13-8= 12-6= 13-7= 14-6= 改錯： 20 以內(nèi)退位減法 13-8= 14-7= 13-4= 15-8= 13-5= 15-6= 15-8= 11-6= 12-3= 13-5= 15-6= 13-8= 13-8= 11-4= 12-8= 11-3= 12-8= 11-4= 16-7= 11-3= 12-3= 11-4= 15-8= 13-8= 16-7= 14-7= 13-9= 12-8= 16-9= 11-9= 16-7= 16

16、-9= 12-7= 12-6= 11-8= 11-7= 12-3= 13-7= 16-7= 16-9= 16-8= 12-4= 13-9= 15-9= 15-9= 12-7= 13-7= 11-6= 15-7= 15-9= 12-9= 11-4= 12-4= 14-6= 11-6= 12-8= 14-9= 17-8= 16-9= 11-7= 16-7= 13-4= 15-7= 11-9= 15-8= 13-7= 13-5= 15-6= 17-8= 11-5= 12-5= 11-5= 11-2= 12-5= 12-7= 11-3= 17-9= 13-8= 16-8= 11-3= 15-7= 11

17、-2= 14-5= 15-6= 12-5= 15-8= 11-9= 13-7= 14-8= 14-5= 12-7= 18-9= 16-8= 11-4= 11-8= 11-9= 13-6= 16-7= 14-5= 12-9= 改錯： 20 以內(nèi)退位減法 12-8= 15-7= 11-7= 14-8= 12-4= 15-9= 15-7= 15-6= 13-7= 14-6= 12-4= 12-9= 13-7= 17-9= 12-4= 12-8= 14-8= 11-5= 14-5= 18-9= 12-9= 11-4= 11-7= 13-9= 14-8= 15-8= 12-8= 13-8= 13-8=

18、16-8= 13-6= 15-8= 17-9= 12-7= 11-8= 11-5= 14-7= 12-7= 11-8= 11-4= 14-5= 15-6= 11-7= 11-5= 11-9= 15-6= 12-4= 15-9= 13-9= 14-8= 15-9= 12-7= 11-2= 16-9= 12-8= 11-8= 12-6= 14-7= 12-9= 15-8= 16-8= 11-7= 15-7= 15-6= 12-9= 12-5= 11-8= 11-6= 11-9= 13-6= 13-5= 11-4= 11-7= 12-9= 18-9= 11-3= 14-9= 17-8= 16-7=

19、16-7= 12-3= 13-6= 12-4= 12-8= 12-9= 15-8= 12-7= 12-4= 12-5= 16-8= 13-9= 11-9= 12-3= 11-8= 13-5= 14-7= 12-9= 13-6= 16-7= 12-8= 改錯： 20 以內(nèi)退位減法 17-8= 12-5= 16-8= 13-9= 12-6= 11-6= 15-6= 11-9= 14-9= 11-4= 16-9= 12-5= 14-7= 13-5= 11-3= 12-3= 14-8= 12-4= 12-9= 11-5= 13-6= 14-8= 11-5= 14-7= 12-3= 13-8= 13-5

20、= 13-9= 11-8= 12-4= 11-5= 11-9= 11-6= 14-6= 13-6= 12-3= 13-8= 16-7= 11-6= 16-9= 11-9= 11-4= 11-4= 11-2= 12-6= 14-5= 12-8= 16-8= 11-4= 12-6= 11-7= 11-3= 12-9= 18-9= 14-6= 12-5= 13-8= 11-3= 12-5= 17-9= 14-8= 12-3= 11-7= 12-6= 14-9= 11-9= 13-7= 13-8= 17-8= 11-7= 16-7= 14-9= 12-7= 14-6= 14-8= 12-7= 11-2

21、= 13-9= 12-4= 13-7= 14-7= 12-7= 15-7= 12-6= 14-9= 15-9= 13-4= 17-9= 15-6= 16-7= 15-9= 17-9= 13-8= 12-7= 12-6= 15-6= 13-9= 12-8= 11-9= 11-4= 改錯： 20 以內(nèi)退位減法 16-7= 13-4= 11-8= 13-6= 12-6= 12-7= 11-7= 15-7= 12-9= 12-6= 16-9= 15-8= 14-9= 11-4= 14-7= 15-7= 11-9= 15-8= 12-9= 15-6= 13-7= 18-9= 15-8= 12-4= 16

22、-9= 16-7= 12-9= 12-9= 11-2= 13-8= 13-9= 13-5= 12-4= 11-4= 12-4= 12-5= 11-2= 11-3= 12-8= 13-9= 12-9= 13-7= 12-6= 17-9= 14-7= 13-9= 14-5= 15-7= 11-4= 11-7= 12-4= 11-4= 17-9= 15-8= 13-7= 15-8= 11-5= 11-3= 11-6= 11-5= 11-6= 17-8= 15-8= 15-8= 15-8= 14-5= 11-3= 11-4= 12-6= 11-4= 12-8= 11-9= 11-3= 13-4= 17

23、-9= 14-7= 12-9= 13-9= 12-8= 17-8= 16-7= 13-6= 13-4= 14-9= 12-6= 15-7= 11-7= 13-5= 11-4= 11-8= 12-7= 13-7= 11-5= 17-8= 11-8= 14-7= 15-7= 12-6= 13-4= 13-6= 改錯： 20 以內(nèi)退位減法 18-9= 13-4= 11-6= 11-7= 12-4= 13-8= 17-8= 14-9= 12-5= 11-5= 11-9= 13-4= 13-5= 12-3= 14-5= 13-9= 12-4= 14-6= 12-3= 18-9= 13-6= 14-7=

24、14-8= 11-5= 14-9= 11-6= 14-9= 12-3= 14-8= 13-4= 14-5= 11-3= 17-9= 15-7= 12-8= 13-4= 12-7= 11-7= 13-5= 17-8= 15-6= 14-7= 11-4= 17-8= 18-9= 11-5= 13-6= 12-7= 16-9= 15-8= 18-9= 13-9= 12-6= 13-9= 14-8= 15-6= 13-8= 11-3= 13-9= 11-8= 15-9= 15-7= 12-7= 11-7= 17-9= 12-9= 12-3= 12-7= 12-4= 18-9= 11-5= 11-7=

25、12-3= 14-9= 13-8= 13-9= 15-7= 16-8= 14-6= 11-4= 13-7= 13-7= 14-8= 16-8= 12-8= 18-9= 15-7= 11-6= 13-5= 11-8= 11-4= 15-8= 13-8= 13-8= 17-9= 15-6= 13-8= 11-3= 11-6= 12-9= 改錯： 20 以內(nèi)退位減法 17-9= 14-8= 13-5= 11-8= 12-7= 13-4= 17-8= 15-9= 12-6= 13-7= 13-5= 13-5= 16-9= 11-8= 15-6= 13-9= 13-5= 16-9= 16-9= 11-7

26、= 15-6= 16-8= 11-4= 16-8= 15-6= 13-9= 14-5= 13-9= 13-7= 13-9= 13-9= 13-6= 11-9= 14-8= 11-9= 13-4= 15-9= 17-8= 16-8= 15-7= 16-7= 15-6= 12-3= 14-6= 14-8= 15-8= 15-9= 12-7= 12-6= 11-6= 11-6= 12-7= 12-3= 12-9= 14-5= 13-7= 15-6= 11-2= 11-9= 11-6= 17-8= 11-3= 11-8= 15-7= 18-9= 16-7= 14-5= 11-7= 12-3= 11-4

27、= 16-9= 13-7= 13-8= 12-9= 17-9= 11-2= 11-8= 12-7= 14-8= 11-8= 15-8= 16-8= 12-4= 14-6= 13-6= 13-9= 14-6= 11-9= 14-6= 13-7= 14-5= 13-8= 12-8= 12-6= 12-5= 16-8= 12-6= 16-7= 14-6= 14-7= 改錯： 20 以內(nèi)退位減法 15-6= 11-2= 11-6= 13-8= 16-7= 12-9= 13-9= 15-7= 12-8= 11-4= 11-9= 17-8= 12-9= 12-6= 12-6= 15-6= 16-7= 13

28、-4= 13-9= 11-3= 15-7= 15-8= 11-8= 16-8= 14-9= 13-7= 15-7= 16-9= 12-7= 13-8= 12-5= 15-7= 13-4= 15-8= 11-7= 13-8= 13-9= 14-7= 17-9= 11-9= 13-8= 17-8= 12-9= 14-5= 16-8= 15-8= 13-4= 13-9= 11-6= 15-6= 17-8= 12-7= 11-5= 15-7= 15-8= 13-7= 14-8= 11-9= 15-6= 12-5= 14-8= 13-7= 11-9= 14-6= 11-3= 12-9= 11-2= 13

29、-4= 15-9= 15-8= 15-8= 14-5= 13-4= 15-8= 11-8= 15-9= 11-7= 13-9= 12-9= 16-9= 13-4= 15-8= 13-5= 13-4= 11-5= 16-9= 12-5= 11-9= 15-9= 14-5= 11-2= 12-4= 12-5= 13-4= 14-5= 11-5= 12-4= 14-5= 15-6= 11-8= 改錯： 20 以內(nèi)退位減法 11-9= 15-7= 13-7= 11-9= 12-8= 14-8= 14-9= 16-8= 12-6= 13-8= 17-9= 16-9= 12-9= 13-7= 12-3=

30、16-7= 12-5= 15-6= 11-7= 14-9= 11-4= 12-3= 14-5= 14-5= 13-9= 13-6= 11-8= 15-9= 12-7= 14-8= 15-8= 16-8= 14-6= 14-8= 12-4= 11-9= 17-9= 16-7= 16-9= 14-8= 12-6= 12-9= 13-8= 11-2= 13-8= 15-9= 15-7= 12-7= 13-5= 11-6= 11-5= 12-3= 15-6= 11-9= 11-2= 12-4= 16-7= 14-6= 14-6= 14-9= 16-9= 17-9= 13-4= 17-9= 11-8=

31、13-8= 13-8= 12-4= 13-6= 15-8= 14-7= 13-8= 14-8= 17-9= 11-5= 16-8= 14-8= 12-8= 15-8= 12-4= 13-8= 12-6= 12-9= 12-6= 15-7= 11-6= 15-9= 16-9= 14-7= 15-9= 11-2= 17-9= 12-3= 11-5= 12-4= 13-7= 13-6= 15-9= 15-9= 12-5= 改錯： 20 以內(nèi)退位減法 11-8= 12-6= 11-9= 12-4= 14-6= 13-5= 14-7= 11-9= 13-6= 14-8= 13-4= 15-6= 14-9

32、= 11-7= 15-7= 11-7= 11-5= 15-9= 16-7= 14-6= 17-8= 11-6= 18-9= 12-8= 14-7= 11-6= 15-9= 11-8= 14-6= 11-9= 14-8= 15-8= 17-8= 12-3= 16-7= 11-9= 13-5= 12-3= 12-8= 14-8= 14-8= 12-3= 13-5= 16-8= 15-9= 15-9= 17-9= 13-4= 14-5= 16-8= 12-8= 12-4= 14-9= 14-6= 12-8= 14-5= 15-9= 12-4= 12-8= 14-7= 11-6= 12-6= 12-3

33、= 11-2= 13-9= 11-9= 11-8= 11-9= 13-7= 11-4= 13-7= 16-7= 12-5= 11-7= 16-8= 15-9= 11-8= 15-6= 12-3= 11-5= 14-7= 15-9= 12-3= 16-7= 12-7= 17-8= 14-7= 13-5= 11-9= 11-5= 11-9= 11-4= 12-6= 14-9= 13-7= 11-8= 13-5= 12-6= 11-7= 16-9= 改錯： 20 以內(nèi)退位減法 12-5= 11-4= 17-9= 16-7= 13-8= 17-9= 14-9= 17-9= 11-4= 15-8= 15

34、-7= 15-8= 15-6= 15-7= 14-9= 13-9= 16-8= 16-8= 14-6= 13-5= 11-3= 12-3= 11-8= 13-8= 15-9= 15-6= 15-7= 13-7= 11-8= 14-6= 14-7= 11-7= 12-9= 13-4= 11-7= 13-8= 17-8= 14-6= 13-5= 15-9= 15-9= 11-6= 14-7= 14-9= 14-5= 11-6= 14-8= 11-3= 11-3= 15-6= 12-4= 17-8= 13-9= 13-5= 13-8= 17-9= 14-7= 16-8= 16-9= 14-7= 15

35、-6= 11-6= 12-4= 11-7= 14-9= 15-8= 13-6= 12-4= 15-7= 15-6= 15-9= 11-9= 16-9= 11-9= 11-4= 12-6= 12-3= 11-9= 14-5= 17-8= 11-2= 12-3= 11-5= 12-4= 14-7= 14-5= 17-9= 13-6= 13-6= 11-9= 15-6= 12-8= 12-5= 14-9= 18-9= 12-5= 12-5= 11-6= 14-6= 12-9= 改錯： 20 以內(nèi)退位減法 14-7= 13-7= 11-8= 13-8= 11-7= 13-9= 12-3= 14-6=

36、14-5= 11-9= 16-7= 16-9= 15-9= 13-9= 12-4= 11-7= 13-9= 11-9= 12-4= 14-6= 16-9= 15-8= 15-9= 11-7= 16-9= 13-4= 12-8= 17-9= 12-3= 11-6= 14-7= 12-7= 13-7= 15-6= 12-9= 11-7= 17-9= 17-9= 12-8= 11-7= 15-7= 15-8= 12-3= 15-6= 15-6= 13-8= 17-8= 13-4= 14-8= 11-7= 12-9= 12-8= 15-6= 12-7= 13-6= 11-4= 13-9= 14-7= 15-8= 15-9= 16-7= 14-9= 16-9= 11-7= 18-9= 14-8= 14-8= 13-7= 15-8= 16-7= 12-5= 15-9= 14-6= 12-7= 11-3= 12-6= 15-8= 12-8= 12-3= 15-6= 16-7= 11-8= 14-6= 13-4= 11-6= 14-8= 11-5= 11-8= 12-3= 15-9= 11-6= 11-5= 14-8= 13-8= 14-9= 11-5= 11-3= 13-7= 14-7= 16-9= 改錯：

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