20以内加减混合运算口算练习题(221).docx

《20以内加减混合运算口算练习题(221).docx》由会员分享，可在线阅读，更多相关《20以内加减混合运算口算练习题(221).docx（59页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

32、0-19=16-6 + 5 =7-3 + 10=20 + 2-9=9-1+4=15-7 + 7二4+3+2=2 + 20-9=2 + 11 - 11=16 - 15 + 7=17 + 15 - 12 =10 + 4-8=9-6+9=6-2+7=6 + 16-16=12 -7 + 9二13 - 12 + 2 =14-4 + 1=4+9-8二17 + 2 - 11=12 -3 + 2 =15 - 14 + 1 =10 + 12-5 =18-8 + 9=5 + 18-19=20-4-4=1+3+2=14-4-8=9-6-1=13-4-2 =2 + 1 + 17=9-9+6二2 + 19 - 13 =

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

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

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

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

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

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

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

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

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