20以内加减混合运算口算练习题(62).docx

《20以内加减混合运算口算练习题(62).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(62).docx（57页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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