20以内三连加减混合口算练习题(236).docx

《20以内三连加减混合口算练习题(236).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(236).docx（55页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

24、0 + 2 =14-1-2 =9-5+9=11-4-7=16-16 + 8=13 + 13-7=14-14 + 6=19-6-1=12-9 + 4=8 + 15-19=14 + 15-20=13-1 + 7=6-4 + 16=19-7 - 12=17 + 6-7=5+3+2=10-9 + 17=1-1 + 17=18-17 + 17=3 + 13 + 1=10-7 + 9=15-9 + 5=5 + 15 - 15 =17-8 + 11=3+9+5=9-2+3二15 -5 + 7=14-11 + 11=1+5-5=1+8-5二5 + 18-4=16-3-3 =8-1+1=15 - 14 + 16

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

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

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

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

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

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

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

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

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

34、0-3 + 7二6+6+8=18-6-9=9-7 + 12 =10 + 2-7=7 + 16-19=4 + 3 + 11 =5 + 13-6=15 - 13 + 18=15 + 6-15=5+7-6=17 + 6-5 =12 + 17-19=15 + 1-14=2-2+7=1 + 7 + 10=18 - 17 + 7=12 - 10 - 1=12-3 + 8=11 + 16-9=15-3-8=6 + 12 + 1=14-2- 10=15 - 11 + 8=17-10 + 6=16-4 + 4 二13 + 13 - 14=15 + 13-9=2+1+9=11-6-3 =1-1+3=13 + 9-

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

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

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

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

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

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

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