20以内三连加减混合口算练习题(62).docx

《20以内三连加减混合口算练习题(62).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(62).docx（53页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

38、0-7 + 1=2 -1 + 11=5 - 1 + 13 =7 -4 + 1二18-14 + 3 =6+2-4=8-6 + 15=1 + 18-9=18 + 3 - 10= 14-3-2 =18 - 5 - 12=20 + 4-17=11-8 + 17=20 - 20 + 17=10-6 + 7=16-3 + 6=2+5+8=12 + 10-11 =2 + 10-8=10-2 + 4 二9+8-4=8-6+5=12-3-9=10-1 + 4=14-4 + 5二3-1+9=1+7+8=14 + 17-20=19-8 + 4=12-7-5 =3+7-6=9-1+4=18-3- 10=18-6-5

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

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

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