20以内三连减口算练习题(207).docx

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1、9-4-2=20-3-7=18-1-9=17-3-5 =17-2-11=18-7-7=20-3-5 =16-7-7=19-5-1 =5-1-2=8-4-3二20 - 18 - 1=18 -11 - 5=12-4-4=14-2-5 =13-2-8=15 - 11 - 3二15-4-8=18-4-8=13-3-5 =17-9-4=15 -11-4=20-1-3 =10-2-7=3-1-2=14-9-5 =14-1-5 =19-8-8=13-9-2=15-3-3 =13-9-4=14-4-8=19-2- 16=16-3-8=14-1- 11=13-5-1=9-7-1二17 - 10 - 3二7-2-

2、1=16-13-1 =6-2-3=15-1-10=15-9-5=20-6- 14=14-7-6=12-5-1 =16 - 5 - 10=7-5-1二8-1-3=16-2-2 =11-1-4=16 - 10 - 5=10-3-2 =12-9-2 =20 -18 - 2=11-5-2=18-4-13 =12-4-8=7-2-3=18-6-12 =20-8-12 =15-4-7=20 - 10 - 9=15-4-2 =16-4-3 =18-4-10=15 - 1 - 11 =20-7-4=18-1- 12=10-1-1 =9-1-4=13-2-7=10-7-1=16 - 12 - 2=19-7-3

3、=15-6-4=20-16-3 =8-1-2=20-6-2 =17-6-11 =20-6-4=12-9-3 =17-4-3 =14-2-7=20-1- 10=10-2-4=15 - 13 - 1=20 - 16 - 1=6-2-1=16-2-10=20-8-2 =9-5-3=17-8-5=19-7-7=11-6-5 =8-1-7=14-9-2 =12-3-3 =17-4- 10=9-4-4=19-11-8=18-9-5 =20-5-7=16-1-4=15-3-1=11-1-3 =14-3-6=17-11-4=11-2-3 =17-4-12 =16-9-2 =11 - 10 - 1=20-1-5

4、 =18-4- 14=18-5-7=19 -18 - 1=17-6-9=11-3-6=15-4-3 =18-2-8=20-4- 14=16-4-8=3-1-1=7-1-5=20-2-6=20-3-9=18-7-6=13-6-6=11-5-3 =12-2-6=13-4-9=16-2-9=20-7-5二18-2-11=20 - 12 - 2=17-4-7=12-3-5 =20 - 12 - 5=16-1-5=14-2-3 =17-1- 16=20-7-2=14-2-6=20 - 14 - 4=19-7-9=11-7-2 =20-5-1二20-3-8=20-3- 12=17-3-2 =18-9-6=

5、18-1-7=18-5-5=19-2-7=17-3-3 =11-1-9=17-9-8=17-4-9=17-4-8=17-2-13 =17-1-8=20-4-15=20-6-7=19-4-9=8-1-5=12-8-3 =20 - 14 - 1=17-11-2 =18 - 12 - 5=18-4-12 =18-2- 16=14-8-4=20 - 10 - 8=19-15-4=7-5-2=18 - 13 - 5=18-3-15=18 - 15 - 3二10-5-1 =11-6-1=16-2-13 =20-17-3 =18-7-4=14 - 10 - 1二19-10-3 =19 - 5 - 13 =1

6、2-1-3 =8-2-2=19-2-6=12-1-8=5-1-1=20-3-2 =18 - 10 - 5 =19-4-11 =16-4-11=18-5-2=19 - 10 - 6 二5-2-1=15-8-2 =16-9-1 =13-9-3 =16-1-1 =17-3-7=18-1-5 =19-11-5 =18-7-11=17-7-5 =7-1-6=16-5-1=11-2-7=16-8-8二13 - 1 - 11=20-4-4=17-3-9=8-1-1=18 - 12 - 2=20-1- 17=18-6-3 =11-2-8=20-5- 10=13-5-8=13-3-3=14-10-2 =8-6-

7、1=10-7-3 =20-9-2二17-3-4=15 - 1 - 12 =15 - 1 - 14=15-6-8=8-2-6=16 - 10 - 2 =19-10-5 =15-1-8=13-3-6=17-5-5 =19 - 10 - 7=13-4-8=20-7-1=15-1-3 =18-4-7=18 - 1 - 11=16-1-6=16-2-8=6-1-5=10-1-4=19-13-2 =20-4-12 =错误率,PH12-6-1=11-1-2 =15-3-9=20-6-12 =14-6-3 =20-8-8=18 - 10 - 6=17-1-15 =16-3-7=16-4-10=14-8-2 =

8、17-9-6=16-5-9=16-3-4=14-9-1=12 - 10 - 1=20-9-3 =17 - 12 - 2 =19-3-13 =15-3-4=19-4-1 =13-4-3 =18-11-7=19-9-3 =15-5-7=9-1-3=9-1-6=11-1-1 =7-1-2=16-7-5 =11-8-1 =9-8-1二20-7-3 =19-8 - 10=18-2-15 =20-6-13 =14-5-9=17-2- 12 =18-5-9=12-1-11=19 - 1 - 17=20-14-3 =8-3-1=19-9-4=19-4-4=20-4-1=18-2-9=12-2-3 =10-4-

9、6=17-6-1=14-3- 10=20-3- 16=15-6-9=7-3-2=15-2-2 =15-4-4=15-3-7=9-1-8=13-1-6=18-9-8二19 - 12 - 5二16 - 12 - 4=17-2-1=17-5-3 =11-2-6=14-2- 11=13-3-8=16-6-4=10-5-5 =15-8-3 =16-1- 10=13-1-5=17-5-2=11-3-3二13-2-11=17-1-2 =19-6-4=19-2-1=15-9-6=19-2- 14=17-8-4=20 - 19 - 1=18 - 11 - 6=20-13-3 =19 -15 - 2=14-3-7

10、=12-2-2 =20-5-13 =14-3-1=19-1-9=11-4-4=19-7-1=6-4-2=15-2-8=18-4-2 =15-4-6=18-6-5 =11 -1 - 10= 12-5-7=18 - 1 - 16=7-3-1=16 - 12 - 1 =14-2-2 =19 - 5 - 11=19-4-10=9-5-2=10-8-1=12-2-4=10-3-1=16-1-14=20-2- 18=20 -16 - 2=10-8-2=13-4-6=18 - 15 -1=12-8-2 =10-1-9=17-2- 14=19-1-6=15-2-3 =9-2-4=16-2-6=19-2-4=1

11、9-5-8=13-7-3 =20-2-13 =20-4-5=15-6-5 =11-3-5=16-8-5 =20-2- 16=12-5-6=20-11-4=17 - 5 - 11=14-2-8=18-7-9=12-2-5 =20-7-9二8-6-2=20 -11 - 9=20 - 13 - 2=17-2-7=18-5-1=11-2-9=16-9-3 =20-7- 12=13-4-4=18-7-2 =20-9-4=19-8-5 =14 - 10 - 4=18-1-13 =16 - 13 - 2=7-6-1=13-10-2 =16-4-9=17-8-2 =16-6-7=15 - 3 - 12 =14

12、-4-2 =16-8-2 = 13-7-6=20-14-5 =13-3-4=20-4-13 =17 - 10 - 4= 17-3-11=15-5-8=17-13-4=15-1-1=18-3-9=15-9-4=20-4-9=13-6-7=16-1-9=19-2- 17= 20-11-6=14-6-2 =17-3-8=17-1- 10=17-6-7=16-5-6=11-9-1=16-3-2=19-8-7=16-2- 14=16 - 10 - 4=17-1-3 =17-1-1=10-4-5 =14-1-7=14-1-8=10-3-3 =18-10-4=10-5-4=18-3-2 =7-2-4=18-

13、4-4=17 - 10 - 2二12-5-2 =20-3-1 =14-5-5 =12-2-1=6-1-1=18-1-3 =17-9-3 =19-16-2 =14-9-3 =8-2-5=6-3-1二16-7-1=20-3-11=16-9-5 =19-8-4=16-6-5 =9-2-5=19-6-1=19 - 1 - 11 =20 -13 - 5=19 -12-4=17-5-9=14-6-6=14-6-7=19-9-7=13-2-4=11-3-2 =19-4- 14=19-4-8=17-4-6=16-6-3 =8-5-2=9-3-2=11-7-1 =19-2- 12 =20 - 10 - 3=18

14、 - 13 - 1=18-4-11 =20 - 12 - 8=20-5-5=18-3- 14=14-5-2=18-2-6=6-1-3=16-8-6=19-5-9=12-8-4=19-5-7=10-2-8=20 - 10 - 4= 5-1-4=18 - 16 - 1=13-3- 10=19 - 12 - 1=6-2-4=17-5-6=12-2-9=17-1-7=11-2-5 =19-9- 10=16-2-4=10-1-2=9-1-5=19-8-6=8-4-4=11-4-3 =11-4-5 =15 - 3 -11=13-10-1=13-1-1=20 - 13 - 1 =14-3-2 =16-6-9

15、=19-1-2 =10-2-2 =20-9-11=19-8-2 =17-3-6=19-1- 16=15-6-3 =6-1-2=2-1-1=13-4-2 =16-4-1=18-11-3 =14-4-7=14-11-3 =17-8-6=13-9-1 =16-1-7=18-1-8=12-7-4=13-4-1=8-2-4=17-14-2 =18-2-2=15-9-3 =20-1-6=17-4-11=14-2-12 =13-1-8=16-11-4=17-6-4=18 - 2 - 13 = 19-5-6=18-5-6=19 - 10 - 9二16-2-12 =20-9-8二19-9-1=20-1-7=13

16、-1- 12= 19-1-8=20-8-6=20-4-16=20 - 16 - 4= 15-10-4=20-4-7=20 - 10 - 7= 20-9-7=19 - 10 - 8= 18-3-5 =9-4-5=19 - 15 - 1=19 - 13 - 5二14-8-5 =13-8-2=18-4-1 =20-6-6=10-6-3 =16-9-4=14-1-2 =12-3-4=15-7-6=10-1-7=10-6-2 =20-5-6=18 -12 - 6=19 - 1 - 12 =15-1-5 =8-7-1二20-2-4=17-2-6=16-2-1=18-8-1 =19-6 - 10=19 -

17、13 - 1=19-7-6=15-1-9=10-3-7=14-8-1=15-4-9=8-5-1=14-1-1=16-7-2=18-8-9=16-4-6=14-5-6=18-9-1=11-4-2 =10-1-3 =15-8-1=20-3- 14=14 - 11 - 1=15-12-3 =10-5-2 =16 - 3 - 13 =4-1-1=12-1-1 =4-3-1二18-8 - 10=18-4-9=16 - 13 - 3=16 - 11 - 5=16-4-5 =15-4-5 =13-7-5 =19-5-5 =18-2-1=15-6-1=20 - 10 - 2 =14-7-2 =11-6-2 =

18、18-2-5 =19 -11-4=20-6-11=16 - 14 - 2=16-6-2 =20-2-7=20-2-8=15-1-7=20-8-11 =17 - 10 - 7=10-1-8=19 -13-4=11-5-6=17-5-4=20-5-15 =19-4-13 =4-2-2=18 - 14 - 4=20-9-9二18-2- 12 =20-2- 17=14-1-4=18-8-6=18 - 5 - 10=18 - 10 - 8=11-1-8=13-4-7=10-6-1 =14 - 12 - 2=13-3-1=15-2-5 =5-1-3=17-7-9=17-6-8=9-1-2=20-5-9=1

19、2-3-9=16-3-3 =16-3-12 =13-1-3 =7-4-1=15-4-10=18-6 - 10=13-6-4=20-2-11=20-8-4=错误率,PH13-7-2 =18-11-2 =17-8-3 =17-9-2 =16-9-6=11-3-7=17-6-2 =19-4-12=9-5-1=12-1- 10=14-2-9=9-3-5=18-2-7=18-1-6=18-3-3 =19 - 10 -1=10-4-2 =16-1-13 =8-5-3=17-7-1=20-2-9=19-15-3 =18-9-3二14-7-5 =17-7-7=20-1-11 =17-8-8=8-1-6=19-

20、2-2=12-6-2=13-1-4=17-4-2 =13-5-6二20-15-1=19-6-7=12-4-7=16 - 10 - 6=19-9-8=20 - 11 - 3二12-2-8=16-7-6=17-1-4=15-7-8=17 -12-4=20-6-5=11-7-4=13-6-2 =19-17-1 =13-8-1=17-9-5 =16-3-9=15-4-11 =17-3-1 =10-6-4=14-1-6=19-6-2 =5-2-2=20-1-13 =20-2-5=17-6-3 =19-3-1=17-9-1=16-1-11 =18 - 12 - 3二17-1-5 =19-7-12 =14-

21、2- 10=18-14-1 =20-2-15=19-5-4=9-6-2=19-9-5=19 - 12 - 6二 15-7-4= 18-1-1 =18 - 10 - 7= 14-5-8=17 - 12 - 1=11-2-2 =17-15-1 =15-8-4=20-7-7=14-7-3 =19-3-5 =17-4-4=14-7-1=15-6-7=15-3-8=6-1-4=9-2-3=17 - 13 - 3=18-4-6=11-7-3 =19-9-9=16-6-8=18-3-10=19-6-13 =14-2-1 =12-4-1 =13 - 1 - 10=20 - 11 - 2=19 - 3 -12=

22、20-6-9=9-2-2=11-1-7=5-4-1=20 -13-4=17-11-3 =19 - 1 - 10=15-8-7=19 - 3 - 14=20-1-2=19-7-8=20-1- 12=13-2- 10=17-2-2=11-2-1=20-2- 10=18-8-3 =17-3-13 =16-15-1 =12-1-5 =18-2-3 =17-1-6=12-1-7=17-5-1 =12-1-2 =8-3-5=18 - 10 - 2=20-3- 10=18-8-5 =16-2-5=11-3-8=11-3-4=13-5-2=18-6-8=18 - 10 - 1=12-5-4=15-5-4=16

23、-1-2 =15-3-2 =16-6-1 =14-3-5 =20-7-6=12-1-6=12-4-5 =19-8-3 =17-14-3 =15-13-2=14 - 12 - 1=14-6-1=19-3-7=18 - 13 - 3=7-3-3=20-11-7=9-6-3=16-1-12 =14-10-3 =18-6-2 =17 - 13 - 1=20-9-1=20-3-13 =20-8-7二15-3- 10=16-1-15 =14-1- 13 =15-5-1=12-3-1=17-1-11 =20-7-8二19-2-3 =18-7-3 =17-8-7=14-8-3 =15-7-7=10-3-4=1

24、9-14-2 =15-10-1=14-7-7=17-2-4=17-4-13 =16-4-12=18-1-2 =19 -12 - 2=10-4-1=9-7-1=17-10-3 =7-2-1=16-13-1 =6-2-3=15 - 1 - 10=15-9-5 =20-6- 14=14-7-6=12-5-1=20 - 12 - 7=19-1- 18 二18-1-15 =17 - 11 - 1=10-3-6=15-1-2 =9-4-2=20-3-7=18-1-9=17-3-5 =17-2-11=18-7-7=20-3-5=16-7-7=19-5-1=5-1-2=8-4-3二20 -18 -1=20-8

25、-5 =19 - 14 - 4=16-1-3 =17-8-1=17-2-3 =18-4-8=13-3-5=17-9-4=15-11-4=20-1-3 =10-2-7=3-1-2=14-9-5 =14-1-5 =19-8-8=13-9-2 =15-3-3 =7-5-1=8-1-3=16-2-2 =11-1-4=16 -10 - 5=10-3-2 =19-7-2 =12-1-4=13-7-5 =19-5-5 =18-2-1=15-6-1 =20-10-2 =14-7-2=11-6-2 =18-2-5 =19-11-4=20-6-11 =12-4-4=14-2-5 =13-2-8=15 - 11 -

26、 3二15-4-8=17-7-6=8-7-1=20-2-4=17-2-6=16-2-1 =18-8-1=19-6 - 10=19 - 13 -1=19-7-6=15-1-9=10-3-7=14-8-1=15-4-9=19-2- 16=16-3-8=14-1- 11=13-5-1=16-2-3 =18-9-1 =11-4-2 =10-1-3 =15-8-1=20-3- 14=14 - 11 - 1二15 - 12 - 3 =10-5-2=16-3-13 =4-1-1=12-1-1=4-3-1=16-6-2 =20-2-7=20-2-8=15-1-7=20-8-11 =17 - 10 - 7=14

27、-6-8=17-6 - 10=17-11-5 =13 -10 - 3=17-6-5 =19-11-7=18-1- 17=15 -10 - 2=12-2-7=19-7-4=14-3-9=20-1- 18=14-1-1=16-7-2 =18-8-9=16-4-6=14-5-6=17 - 10 - 5二20-1- 14=13-3-9=18-6-11 =20 - 11 - 5=20-4-11 =12-7-3 =10-1-5 =17-2-9-13-2-6=15-3-5 =5-3-1二12-8-1=16-13-3 =16 -11 - 5=16-4-5 =15-4-5 =7-2-2=12-4-3 =13-5

28、-3 =14-4-9=18 - 1 - 10=18-7 - 10=11-5-5 =16-3-11=13-2-3 =17-5-7=18-11-4=18-5-8=18-5-4=20-2-12 =11-1-5 =17-5- 12 =15-11-2=14-6-5 =20 - 12 - 1=15-2-9=17-15-2 =15-2-7=13-5-4=15-5-9=19-3-9=13-5-5=12-6-4=20-5-2 =17-6-6=19-5- 10=16-5-8=18 -13 - 2=6-3-3=18-9-7=20-9-5 =17-7-3 =19-6-12 =14-8-6=14-5-4=18-8-4=

29、18-4-5 =19-1-15 =8-3-3=20 - 12 - 3=18-14-2 =16-2-7=13-8-4=9-3-4=18-9-2 =12-6-3 =19-2-5 =8-2-3=11-8-2 =15-7-3 =19 - 3 -10=16-5-4=17-7- 10=17 - 14 - 1=19-3-15 =14-1- 10=10-2-5 =17-1-13 =20-3-3 =18-3-8=19 - 17 - 2 =12 - 10 - 2 =18-5- 12 =9-2-1=19-1-5 =19-14-5 =19-1-13 =19-8-9=20 - 14 - 2=18-5-11 =6-4-1

30、=20-5- 14=19-4-6=18-3-4=11-8-3 =15-2-13 =14-1-12 =11-9-2 =14 - 13 - 1=18-1-4=20 - 14 - 6=20 - 5 - 11=5-3-2=20-5-3 =14-4-6=19 - 11 - 3 二18-8-8=10-2-1=11-5-4=15-5-2 =12-3-7=17 - 10 - 1二10-7-2 =15-2-12 =19-6-5 =20-7 - 10=9-1-1=10-2-6=14-4- 10=16-2-11=20-1-9=20-5-8=19-4-5 =19-2-13 =9-3-6=15-4-1=9-4-3=17

31、-3- 12 =15-5-6=20 - 10 - 1=20-9 - 10=19-3-2 =17-4-1=15-9-1 =20-2-2 =19-2-9=17-4-5 =20-1- 16=14-2-4=18-7-5=17-9-7=19-14-3 =15-2-11 =17-2-5 =19-1-3 =20 - 12 - 6=16-5-11 =15-6-2 =11-4-7=19-4-2 =19-7 - 10=6-3-2=14-4-4=20-1-4=10-1-6=19-3-4=18 -12-4=20 - 17 - 1二10-2-3 =20-11-8=12-7-1=13-3-2 =18-6-7=13 - 1

32、2 - 1 =15-10-3 =20-3-4=11-5-1=20-8-1=18 -15 - 2=19-2-15 =15-8-5 =17-7-4=16-3- 10=17 - 3 - 14=18-3-7=13-8-3 =18 - 12 - 1=16-3-5 =20-1-1=19-3-16=18-11-1=17-1-9=20-15-2 =14 - 11 - 2 =19-11-6=14-1-9=4-1-3=18 - 17 - 1=20-1- 14=13-3-9=18-6-11 =20 -11 - 5=20-4-11 =12-7-3 =10-1-5 =17-2-9=13-2-6=15-3-5=5-3-1

33、=12-8-1 =17-2-8=18 - 13 - 2=6-3-3=18-9-7=20-9-5 =17-7-3 =12-4-3 =13-5-3 =14-4-9=18 - 1 - 10=18-7- 10=11-5-5 =16 - 3 -11=13-2-3 =17-5-7=18 -11-4=18-5-8=18-5-4=19-4-3 =8-2-1=12-6-3 =19-2-5 =8-2-3=11-8-2 =错误率,PH17-6 - 10=17 - 11 - 5 =13-10-3 =17-6-5 =19 - 11 - 7=18-1- 17=15-10-2 =12-2-7=19-7-4=14-3-9=2

34、0 - 1 - 18=12-6-5 =20-2- 12 =11-1-5 =17 - 5 - 12 =15-11-2 =14-6-5二20 - 12 - 1=15-2-4=10-4-3 =20-1- 19=19 - 3 - 11 = 20-4-10=16-3-6=20-3-15 =20 -13 - 7=17 - 5 - 10= 15-2- 10=20-5-12 =15-2-1 =19 - 13 - 6=16-8-3=13-7-4=20-8- 10=5-2-3=19-11-2=3-2-1=7-4-2=14-5-3 =14-4-5二13-5-7=4-1-2=20 - 11 - 1 =13-2-9=1

35、8-7-1=7-4-3=12-3-2 =20 - 10 - 6=20-5-4=15-1-6=10-4-4=20-4-2 =16-9-7=20-17-2 =16-8-1=9-7-2=19-8-1=15-3-6=13 - 11 - 1=14-3-3 =20-15-3 =9-2-6=16-1-8=13-2-5 =20 - 10 - 5 =20 - 10 - 10=20-3-6=16-7-8=17-8-9=11-6-3 =19-2- 10=19 - 12 - 7=20-9-6=20-4-6=15-2-6=16-7-4=15 - 14 - 1=14-9-4=8-1-4=15-10-5 =20-8-3 =

36、17-1- 12 =13-6-3 =19-7-5 =15 - 1 - 13 =16-5-3 =7-3-4=20-7-13 =16-5-5 =16 - 11 - 2=20-1-15 =20-6-3 =12-5-5 =9-6-1二16-7-3 =20-6-1 =19-14-1 =20-2-1=14-5-7=19 - 1 - 14= 19-6-6=19 - 12 - 3 =18-9-9=19 - 10 - 4= 16-4-2=17-2- 10=19-6-3 =18-3-13 =12-4-2 =12-5-3 =17-7-2 =15 - 12 - 2=13-11-2=17 - 16 - 1=18-2-4

37、=19-3-8=18-2- 10=12-7-2=15-8-6=13-2-1 =10-3-5 =12-4-6=13-1-9=18-3-11=18-5-13 =16 - 10 - 3二7-1-4=14-5-1=14-7-4=19-5-2 =16-3-1=15-7-1=20-2-3 =20 - 15 - 5=16-11-3 =19-3-6=17 - 10 - 6=16-6 - 10=11-4-1 =12-2- 10=20-7-11 =14-4-3二17-2-15 =20-4-3 =12-7-5=19-10-2 =18-10-3 =17-7-8=7-2-5=10-9-1=18-7-8=15-7-5 =

38、4-2-1=17 - 12 - 3二10-5-3 =20-4-8=19 - 13 - 3=19 - 5 - 14=12-3-8=15 - 12 - 1=8-3-2=19 - 16 - 3 二15-1-4=9-1-7=18-6-6=15-7-2 =19-11-1=14-6-4=13-6-5 =16-4-7=20-8-9二20 - 3 -17=18-8-7=11-6-4=14-3-8=15-6-6=20-6-10=20-6-8=19-5-3 =16 - 10 -1=18-8-2 =14-3-11 =19-4-15 =18-1- 14=17-3- 10=16-2- 10=20-8-2 =9-5-3=

39、17-8-5=19-7-7=11-6-5 =8-1-7=14-9-2 =12-3-3二17-4- 10=13-2-2 =19 - 5 - 12 =18-3-6=20-1-8=16-8-7=18-2- 14=12-9-2 =20 -18 - 2=11-5-2 =18-4-13 =12-4-8=7-2-3=18-6-12 =20-8- 12=15-4-7=20 - 10 - 9=15-4-2 =16-4-3 =15-5- 10=18 -16 - 2=19-9-2=16-4-4=19-1-7=13-2-7=10-7-1 =16 - 12 - 2 =19-7-3 =15-6-4=20-16-3 =8-

40、1-2=20-6-2 =17-6-11=20-6-4=12-9-3 =17-4-3 =19-11-8=18-9-5=20-5-7=16-1-4=15-3-1二11-1-3 =17 -13 - 2=19-4-7=14-2-6=20 - 14 - 4=19-7-9=11-7-2=20-5-1=20-3-8=20-3-12 =17-3-2 =18-9-6=18-1-7=18-5-5=15 - 1 - 11= 20-7-4=18-1- 12 =10-1-1 =9-1-4=13-3-7=14-3-6=17-11-4=11-2-3 =17-4-12 =16-9-2 =11-10-1=20-1-5 =18-4- 14=18-5-7=19 - 18 -1= 17-6-9= 11-3-6= 15-4-3 =10-2-4=15 - 13 - 1=20