20以内三连加减混合口算练习题(262).docx

《20以内三连加减混合口算练习题(262).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(262).docx（56页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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