20以内三连加减混合口算练习题(147).docx

《20以内三连加减混合口算练习题(147).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(147).docx（54页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

29、2+3+5=16-13 + 1=8 -4 + 9=7+2+8=17 -10 + 3 =17-6-3 =7+8+2=11-7 + 7=15-1-7=13 + 12 - 16=16-14 + 15 =15-13-2=18-1-5 =9-1-3=11-9 + 2 =10 +1 + 8=16 + 4-9二11 + 10-16=16 + 16-16=7+6+4=4 + 11-2二8-4 + 14=16 + 11-8=11 + 2 + 5 =17 -13 + 9=19-14-2 =9-9+2二8-7+5二6 + 15-6=20-4-1二17-5- 10=8-5-3=12 - 10 + 10=17 + 11

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

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

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

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

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

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

36、=4 + 16-11=17-7 + 10=10-6 + 5 =19 - 15 + 10=11 -3 + 4=13 + 3 - 14= 20-2-1=20-2 + 2 =3 + 3 + 11=14 + 5 - 17=10 + 9-14=15-1-3 =4+5-4=6 + 14-18=7 + 15 - 19=6-2+1=12-5 + 8=7 + 14-11=19 - 12 - 3二13 + 8-2二9 + 12-7=2+9-8=7-3 + 11=4 + 8-11=5 + 17-7=6-6 + 16=9-7+9=4 + 14-11 =10 + 12 - 16=16-14 + 12=20-5- 10=

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

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

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

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

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