连加连减30以内加减法

《连加连减30以内加减法》由会员分享，可在线阅读，更多相关《连加连减30以内加减法（24页珍藏版）》请在装配图网上搜索。

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

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

3、+13 =10 + 7-17=6 + 14-19=1 + 18 - 8 =16 8 +9 =19 4+5=7 + 13 -6=7 + 10 -7 =19 + 1-6 =13 4+8 =9+6+10 =3 + 7+5=17 4 - 6 =14 +7+7=88+20=9 + 8 -7 =14 + 4 - 4 =7 + 6+8=17 5-3=15 12+5 =20 1 -1 =5 5+0=10 + 10-17=8 1+9 =12 +7-3 =6 2+13=10 2-3=5 3 + 8 =6 2 +8 =15 6+9=15 6+46 + 11 - 8 =8 + 9+7=5 + 7 +4=2+11+8=

4、12 +2+3 =17 + 5-20 =66+20 =16 1-416 9 - 2 =10 + 8-15=9 3+7=5+2+3=11 7+5 =11 + 6-9=20 7+13=11 4+4=15 + 1 - 6 =11 8+2=23 3-16=12 10+2 =8 + 2+9 =12 1 - 6 =12 + 3-8 =15 +2+6 =7 + 12+5 =17 4+2 =15 4 -2 =2 + 10+4 =12 + 7-12 =20 11-8 =5 + 15- 6 =16 16+9 =15 +4+6 =14 3+5 =1 +16+7 =2 + 13+4 =15 + 4-7 =19 10+

5、3 =13 +7+0 =19 3-6 =13 12+8 =11 4+9 =18 6-6 =14 14+8 =14 + 6-11 =14 5- 8 =16 14+8 =18 3+5 =7 + 9+2 =99+15 =3 + 7-5 =1 + 13-6 =2+15+2 =11 + 7-7 =8 3+4 =7+11+4 =10 +7+7 =7 + 4+5 =16 +3+2 =11 + 3+6 =15 + 2-6 =17 6+2 =11 + 8+4 =14 + 3-7 =15 +2+8 =4 + 16 - 6 =15 + 4-9 =9+11+8 =12 3+9 =3 2+3 =10 3+8 =5 +

6、15-6 =5 + 15-19 =20 8- 6 =20 16-2 =98+17 =2+13+7 =18 17+11 =14 +5+7 =12 +6+4 =15 + 2-9 =14 + 6-8 =10 + 7-6 =17 6+2 =12 9+7 =20 13+7 =3+8+10 =6 1+7 =8 + 2+4 =4 + 14-8 =11 6-2 =1 + 19-15 =2 + 18-6 =18 10+14 =55+13 =8 2+7 =14 12-1 =14 + 3-6 =17 +2+7 =18 6-12 =7 + 4+3 =12 +3+7 =3+14+2 =13 2-0 =4 + 13-6

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

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

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

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

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

12、0-7 =15 14+7 =10 6-0 =9 + 1+2 =4 2+6 =8 4-2 =4 + 11 + 1 =14 + 6-3 =15 + 2-9 =4 + 10+1 =4 + 9-3 =19 12+4 =19 2+8 =11 + 7-6 =7 5+2 =8 4+6 =15 10-4 =10 5-4 =20 19+7 =6 4+7 =33+12 =16 7-1 =4+10+5 =12 12+8 =17 +2+1 =7 + 4+2 =2 + 12-2 =7 + 13-6 =17 5+2 =7 -7+7 =3 + 14-4 =2015-1 =6 2+7 =142-8 =11 2+2 =6 -5

13、+8 =16 3+2 =14+ 2+2 =19 14-1 =8 8+5 =10 + 4-3 =1913-1 =15 + 1-5 =5 + 5+7 =20 2-10 =5 + 13-6 =16 15+7 =9 4-2 =6 + 12-5 =151+9 =7 + 4+6 =3 1 + 11 =10 6-3 =132+8 =8 + 8+3 =1614-0 =14 + 4-7 =142+2 =8 + 8-2 =207-4 =19 15-4 =123+7 =11 + 4-5 =123+8 =18 10-2 =4 2+2 =8 + 7+2 =8 + 3-4 =7 + 8+2 =2014-2 =10 6-4

14、 =14+ 6-9 =5 1+4 =177+2 =13 6+7 =6 + 8+2 =14 + 1-6 =154-7 =11 + 2-4 =2 2+7 =9 + 8+5 =11+ 6-3 =3 3+9 =13+ 5-3 =12 +1+2 =5 + 8+7 =4 + 11-6 =8 2-3 =16 + 1-4 =7 + 3+2 =11 2+8 =5+13+1 =1+12+5 =4 + 16-8 =9 4+3 =16 5-6 =9+10+0 =9 + 4+1 =13 10+7 =18 12+7 =12 10+9 =14 7-2 =18 18+4 =3 + 10-4 =18 18+7 =4 2+6 =

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

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

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

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

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

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

21、 + 6-7 =8 7+9 =13 + 7-6 =11 + 8-4 =16 8-4 =2 + 17-5 =8 + 10-4 =17 14-1 =20 19+5 =16 6-7 =16 + 3-7 =14 1+5 =16 + 4-8 =7 4+6 =5 + 12+2 =7 + 12-6 =11 + 4-3 =3 + 15-5 =16 14-2 =3 + 7+2 =4 + 9-4 =8 8+0 =17 6-10 =8 + 4-5 =14 12+6 =13 + 1-8 =1 1+8 =9 + 7-7 =5 + 7-4 =2 + 8-4 =1 + 18-16 =15 7+3 =14 10-2 =3 +

22、 10-5 =19 18+5 =1 + 16-5 =10 9+7 =14 3-6 =11 + 9-12 =10 + 9-7 =10 + 6-4 =13 13+8 =17 3-4 =19 5-12 =11 + 6-5 =11 3-5 =8 + 9+3 =19 17+3 =7 + 5+2 =17 10+5 =11 9-0 =9 1+5 =1 + 18-8 =13 10+7 =20 1-13 =15 10-1 =15 7-1 =9 + 7-6 =3 + 10-12 =15 12+3 =14 +4+2 =19 18+0 =18 10+7 =12 + 8-6 =3 + 14-13 =20 13-5 =8

23、 2-2 =2 + 9+2 =6 3+3 =7 + 4+1 =13 12+8 =1 + 10-6 =19 16+4 =12 12+3 =16 13+7 =8 + 8+4 =19 17-1 =10 2-8 =11 + 7-1 =1 + 19-16 =15 15+16 =13 + 7-4 =6 + 5+2 =5 + 10-14 =3 + 11+2 =20 1-11 =7 5-0 =14 + 6-18 =4 + 11-6 =19 1-10 =14 + 4+1 =9 + 6-2 =6 + 13-7 =12 +6+2 =19 5-4 =15 5-4 =2 + 15-8 =18 15+7 =12 9+5

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

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

26、 =14 7-6 =20 13-4 =8 + 2+2 =15 7+2 =5 4+9 =15 + 4-8 =20 8-10 =4 + 15-11 =1 + 14-8 =9 + 2+6 =7 1+3 =3 + 7+8 =3 + 13-4 =10 + 1-8 =7 4-2 =20 16-2 =16 5-5 =16 3-5 =20 12-4 =12 4-3 =18 2-11 =7 + 13-4 =17 8+5 =13 1-7 =4 + 12+2 =19 8-6 =16 1-10 =65+18 =6 3+9 =13 + 5-2 =3 + 9-8 =10 +1+3 =20 9-10 =6 + 8-7 =1

27、2 + 1-6 =11 9+8 =18 3+3 =14 9+8 =54+11 =3 2+9 =3 + 14-6 =9 + 10-7 =3 2+8 =3 + 14-10 =20 8-11 =11 5-2 =3+12+5 =13 9+3 =14 3+7 =4 + 7+4 =9 + 1-8 =10 4-2 =7 + 12-4 =9 + 9-8 =12 4+2 =9 + 8-5 =4 + 7+2 =8 2+8 =6 + 8-8 =16 3-4 =3 2+2 =8 + 5+2 =20 1-12 =1 + 11-5 =11 2+5 =12 8+5 =15 1-10 =2 + 11-4 =1 + 17-7

28、=3 + 10-2 =11 + 7-2 =15 10-1 =15 1-8 =4 + 15-11 =11 10+7 =14 4-2 =3 + 10-6 =16 + 4-2 =20 15-2 =18 14-5 =14 + 3-10 =13 + 3-10 =19 16-1 =55+10 =15 14+6 =6 + 4+2 =9 + 5-4 =8 + 8-2 =13 + 6-7 =10 + 7-4 =1 + 9+3 =17 5-10 =18 7-4 =15 +3+0 =16 5-10 =19 7-6 =18 14-2 =4 + 15-6 =20 3-7 =3 3+9 =10 + 7-4 =18 2-1

29、1 =16 + 1-2 =6 6+8 =44+10 =9 6+8 =16 8-6 =20 16-2 =4 + 15-6 =19 11-2 =1 + 13-10 =13 +4+2 =2 + 17-5 =3 + 16-5 =9 + 9-11 =20 12-6 =9 + 10-8 =2 + 17-14 =17 8-6 =7 + 13-2 =7 + 5-2 =20 13-1 =5 + 8-5 =9 5+8 =12 + 3-3 =18 6-5 =4 + 10-2 =15 13+2 =9 + 8-5 =12 +5+1 =8 3+5 =20 7-10 =4 + 6-7 =16 14+2 =6 + 8-4 =

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

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

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

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

34、5 + 10-5 =14 6+2 =9 3+2 =7 3+2 =12 1+2 =4+ 11-7 =8 + 3-1 =6 + 11-5 =11 7-4 =18 11-2 =19 7-2 =6 + 8-5 =18 5-10 =17 6-2 =11 + 4-8 =11 + 7+2 =14 13-0 =17 7-8 =4 + 9-2 =3 + 17-5 =13 12+5 =15 +1+2 =20 14-3 =17 13-2 =5 + 12-8 =17 1-4 =14 11-0 =3 + 9+2 =20 16-2 =7 + 7-4 =16 5-4 =11 10+5 =19 19+2 =10 + 3-8

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

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

37、 + 7+2 =1 + 19-11 =4 + 10-6 =8 5+8 =10 5-5 =8 + 8-5 =19 18+3 =10 9+3 =1 + 17-11 =8 4+8 =14 5-4 =4 + 11-8 =13 10-1 =11 + 7-4 =17 10-4 =17 2-4 =11 6+2 =7 + 13-2 =18 12+2 =15 11-2 =18 8-8 =13 + 1-8 =8 + 9-4 =9 + 11-3 =15 4+7 =11 +9+2 =12 + 7-13 =13 + 6-5 =65+12 =2 + 14-4 =7 + 5-2 =18 6+2 =15 1-10 =4 +

38、13-5 =8 + 9-4 =20 8-12 =11 4+5 =1 + 13-8 =18 11-2 =16 + 1-5 =6 + 9-4 =16 8-2 =9 1-7 =16 12-2 =6 5+2 =3 + 7-2 =5 + 13-2 =13 4-5 =6 + 7+2 =3 + 14-11 =15 7-7 =19 12-2 =8 + 2+2 =8+3-7=9 + 7+2 =17 + 2-5 =12 8-0 =6-6+7=1+14+1 =10 + 1 + 1 =13 + 4-4 =5-3+8=17 8-8 =18 9+8 =18 6-8 =16-8+2=4 4+9 =11 3+2 =7 + 13-2 =17+4-8=12 + 1-8 =15 3+4 =7 + 12-8 =6+7-2=11 1-4 =4 + 11-8 =15 14+2 =13-11+2=16- 2+8二17- 9+7二18- 8+2=16+2-10=20-6-7=21+2-4=5+7+3= 6+8+4=