20以内三连加减混合口算练习题(82).docx

《20以内三连加减混合口算练习题(82).docx》由会员分享，可在线阅读，更多相关《20以内三连加减混合口算练习题(82).docx（57页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

22、9 + 20-16=4-2 + 14=17-4 + 4=16-12 + 8=12 + 12 - 5二19 + 6-15 =5+4+4=19 -3 + 4=17 + 3 - 18=12 + 20- 20=19 -17 + 3 =14-12 + 1=8 -5 + 15 =11-2 + 7=14-13 + 7=10-5 + 15 =16-3 + 1=9+1-6二6 + 14-10=16 -10 + 2=1 + 10 + 6=7-3 + 11=20 - 6 + 2二10-7-2 =20 + 7-18=7-7 + 10=15 - 15 + 17=10 + 6-14=13 + 7-8=10 + 12 -

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

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

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

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

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

28、12 + 5=19 + 16-19=8 - 3 + 4二1-1+4=19-13 + 6=14-9 + 15=12 -12 + 3 =1+1+3=14-8 + 8=17-13 + 16=10-8 + 18=10-6 + 5二2 + 10-7=7-5+6二13 + 20-15 =14 + 10-7 =17-8-1 =4+9+4=13 + 13 - 15 =10-9 + 17=3 + 15 - 13 =14-8 + 10=5+4-7二18-6 + 7=17 + 5-2 =12 + 7-11 =20-9 + 9二14-14 + 3 =5+5+5=20-12 + 11 =4 + 12 + 3 =11-4

29、 + 9=19-3-6=17-6 + 8=15 - 14 + 2=13 - 12 + 14=15 + 3 + 2= 16-3-8=11 + 7-16= 4+5-7二12 + 18-11=19 - 17 - 1= 17-9-1=19 + 10-9=3 + 12 + 3 =16 + 13 - 15 = 4+3+4=13 + 3-6=12 + 16-9= 1+9+1=3+5+6=12 -12 + 9=14-6 + 6=12-1 + 9=14-3 + 5=8+9+2=10 + 8-4=12 + 5 - 16=14-14 + 9=16-6-2 =11-8 + 15 =16 + 12 - 16=10 +

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

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

32、-2=15-7 + 12 =11 + 10-13 =11-1-4=1 + 20-13 =17-3 + 3=1+8+9=17-6-11 =17-16 + 13 =19 - 14 + 9=17 + 10-16=18-15 + 14=2+9+8=11-5 + 10=10 + 16-17=10-6 + 4=11 -6 + 2 =20-3-6=17-16 + 11=13-9-2 =1 + 7 + 10=6-6 + 12二6+5-4=3 + 3 + 10=16-9 + 7=5-5 + 18=2 + 10 + 2=10-1 + 6=4 + 2 + 11 =20-15-4=9-2 + 3=10-8 + 15

33、=7-5+5=5-4 + 10=17-3-6=16 + 1-2 =13 - 13 + 19=20 + 20- 20=16-3-6=15-5-4=1 + 2 + 12=9 + 13 - 18=10 + 12 - 10=15 - 11 + 10=15 + 2 - 16=3 + 17-10=2+3-2二11-7 + 4=6 + 18-20=4-2+6=8+2+1=17 - 17 + 15 =11-6-2 =13 - 10 + 9=9 + 10-14=2 + 1 + 14=8 + 12-6=14 + 17-16=19-7-2 =8 + 19-8=12-1 + 1=15 - 12 + 12=5-5 +

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

35、 + 7-11=2 + 18-1=14 + 1-7=13 + 5-6=20 - 1 - 17=9+2-4=6 + 8-11=11-9 + 11 =19 + 10-13 =6+5+7=17-11-1 =18 - 14 + 5 =17 + 17-16=2 + 4 + 14=5+7-4=15 - 5 + 4=20-3 + 2 =18 + 5-10=15-2-7=4+7+9=16-3-13 =20-9-5二11 + 4-11 =17 + 8-10=16-7-2 =15-11-4=14-12 + 5 =15 + 12-9=16-12 + 4=2 + 20-8=6 + 16-14=14-3+4=15 +

36、9-8=19 + 14-15 =5 + 10 + 5 =7 + 15 - 10二20 - 10 - 10=9+6-2二5+2+2=2+4+7=2+4+1=14 + 7-14=1+4+6=20 + 14-14=6 + 3 + 10=4+1+7=5 + 14-12 =10 + 7 + 3 =3+5+7=14-8 + 11=7 + 20-10=15 + 5-1 =1 + 13 + 4=5 + 15-20二19 -19 + 2 =4 + 14 + 1 =17 + 2-7=20-16 + 11=14 - 11 - 2 =14-5 + 11=20 + 10-15 =1 + 17-2 =9 + 14-8=1

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

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

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

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

41、7-6+5=19 - 14 - 1=10-3 + 5 =10-5-5 =20 + 8-16=16-5 + 8=20 -18 + 6=10-10 + 4=19 - 16 + 7=17 + 15 - 13 =2+1+8=13-9 + 12 =17 -10 + 6=13-3-10=12 - 10 + 17=20-1-8=15 + 13 - 18=4-1-3=8 -4 + 8二15-9 + 11 =19-3-7=8+5+6=3 + 20-9=3+5+5=8-6-1=5+5+3=20 + 6-12 =9+8-1=14 + 6-9=12 - 10 + 13 =7 + 3 +10=18 + 5-20=4-3+4=15 + 13 - 13 =19-4-12 =3 + 5 + 11=7 + 16-15 =7 -5 + 11=19-4-7=14 + 16-17=3-1+9=18-12 + 9=20-4-7=12 + 16-17=6+5+1=12 + 7-15 =14-5-4=12 + 2 - 13 =1