20以内三连加减混合口算练习题(208).docx

《20以内三连加减混合口算练习题(208).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(208).docx（54页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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