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1、15-12 + 8 =2 + 17 =14 + 5-O =12 + 0 6 =1+4 =10-5 + 5 =4-3 =8-7 =6 + 2 =2 + 10-1 =11-4-3 =6+860 + 20 + 0 =1 + 18-7 =7+4+1=1 + 17 =5 + 0 + 15 =8-1 =13 + 5-0 =18-14 =17 + 2 =0 + 2O =1-0 =11 + 9 =15-2 =20-10 =16 + 3-1 =82+8=13 + 1 + 1 =4+6+3=20 9 + 3 =12 6 4 =3+6313-2-11 =1 + 19 =6 + 13 - 9 =164 =2+3+8=
2、17-4-10 =20-20 + 13 =10 + 8-13 =18-1 =11-10 =19-11-2 =6 + 1 + 10 =18-11 =13-3-8 =5 + 14-10 =15-14=20-12-7 =3+77=6 + 6 =6 + 3 =15-3 =12-2 =19-3-0 =5 + 14-0 =10-9 =5 + 11 =12 + 0 =10-9+4 =5 4=10 + 6 =2 + 13 =18-9 + 10 =3 + 14-10 =2+3+8=14 + 6 =13-1 =18+2 =7+3+8=17-8-5 =14-4 =16-3 + 3 =12-10 =16-15 + 1
3、8 =20+0 =17 + 2-15 =13-13 =94+6=18-8 + 1 =15 + 5 =15-9-1 =13 + 1 2 =1 + 13 =1 + 11-1 =15 + 1-14 =10 + 8 =18-14=13-2 =17-12 =11 + 8 + 0 =19-17=8-4 =11-11 =2-1 =5 + 3 =19-10-5 =10 + 7-3 =9+6+4=14-12 + 6 =14-8 + 3 =15+4 + 1 =3 + 11 =16+0 =1 + 16-2 =11-1 =14 + 2 =1 + 11-6 =13+0 =62 =9 + 5 =18-13 =11-10
4、+ 7 =14-10+3 =4+0+3=17-16 =3 + 16 =8+1+7=13-11 =13-7 + 0 =11 + 3 =0+3+1=3+2+0=19-6 =18 + 1-8 =16-11 =1+8-1=4-0+4=1 + 1 =12-3 + 9 =4 + 13 =15-7 =16+2-14 =5-3 =2 + 0 + 14 =11-2 =0+9+3=13-4 + 10 =70=16+4 =8 + 5 =3 + 7 =15-7 =20-16+12 =11 + 7 =42+0=12 + 6 =9 + 1O =7-3-0=9-0+1=6-0-5=6 + 2 =18-3 =15 + 3-1
5、8 =2 + 8 10 =7 + 0 =17-5-10 =13-8-3 =20-10 =7+2+6=4 + 10 + 0 =2+3+1=11-2 + 11 =4+4 =16-10 + 13 =4 + 3 =12-1-1 =9 + 10 =63+5=14-2 =4 + 2 =1 + 13 =18-9 + 5 =17 + 1-10 =17-15 =5 + 10 =18-0 =40 =17-8-0 =15-9-6 =9+1-3=1 + 12-1 =7-5-1=18-15 =6 + 11 + 3 =1 + 10-4 =11-2 =2 + 14 =14-1 =4 + 10 + 0 =3 + 15-9 =
6、17-11-2 =0 + 3 =5 + 11 =8 + 3 =16-14=2 + 5 =1 + 3 =2 + 15 =1 + 9 =0 + 5 + 13 =15-12 =11-11 =17-9 =16+1-10 =13-2-9 =11-0-9 =13+0 =7-1 + 11 =19-2-8 =7 + 13 =9 + 5 =20-6 + 1 =14一04 =13-13 =11 + 1 =62 =15-12 + 6 =12-11 =7-0-2=4 + 10 =9 6 =0 + 12 + 2 =12-10 =10-7 + 17 =o+o=15-14 + 2 =14 + 2 =16-14-0 =16-
7、6 =83+3=18-12 + 10 =8+069 + 9 =3 + 10-7 =18-0 + 2 =19-17 =10 + 1 + 7 =4+9+5=7 + 11 + 2 =1 + 4=8 + 10 =7-3 =73+1=5 + 9 =9-3 =17-17 =19-11 =4 + 1 =6 + 11 =13+4-14 =4 + 15 =1-0+2=4+3+2=2 + 12 =14-7 + 7 =73+4=16-16+14 =2+868 - 6 8 + 10-12 =3+9+6=2 + 14 =8-1 =6 + 13-12 =1 + 14 =18-3-7 =14-5 =85+2=12-9 +
8、8 =9+8+0=9-8 =12-6 + 10 =6 1 =19-6 =20-8-8 =15-3 =15 + 1 =13-12 + 6 =3+5+5=13-10 + 9 =2 + 13 =0+8+7=8 + 10-5 =6+6+6=12 + 0 =20 2O =17-7-9 =16-13 =17-14-2 =13-8 =31+2=18-5 =10-0-7 =5 + 13 =5 + 10 =10-8 + 18 =7-1 =19-9 =20-5 =4-1 =11-4 =16-11 =4 + 6 =9 + 1O =15-3-10 =4-1 =0+7+3=13-3 =17-2 + 2 =13-6 =1
9、8-17 =18-2 =18-11 + 13 =2 + 11 =10-5 =2-1+4=13-11 =18-0 =18-2 =12-9 + 8 =7-6-1=20-12-5 =62+=16-14+16 =4+58=9-0 =o+-o=14-0-11 =11 + 8 =8-7+7=19-7 =7 6 =9 + 7-10 =13-9 =98+1=12-5-5 =10 + 9-17 =5 + 13 =2 + 12 =7+3+5=9+31=19-14 =20-2-11 =3+1+9=20-9 =1+7-617-0-8 =9 + 1-10 =7 + 5-11 =16-14-1 =9-1-6=2+0+1=
10、17-0 =9 8 =10-2-4 =4 + 12-15 =7 + 13 + 0 =15-0 =2 + 11 =16-15+4 =1 + 6 =15-4-8 =3 + 15-7 =4-0+4=9 + 10 =1 + 14-11 =9 + 5 =64=14-6-2 =4 + 14 2 =2+2+4=7 + 12 =18 + 0 =19-10 =6 + 1 =16+2 =8+1618 + 1 2 =19-5 =20-16-2 =15-13 =1 + 2 =17-6 =1+4+1=6 + 8-10 =16-10-0 =12-12 =4 + 5 =10+4 + 3 =7+0-1=1+8-6=5+5-6
11、=16-13 =0 + 5 =16-2 =4 + 1 + 15 =14 + 3 + 2 =13-0-1 =1+3+2=0 + 3 =16 + 0-15 =9+0+5=20-0 =11-5 + 14 =15 + 1 =19-4 =9+5+4=19-1-4 =1+3+2=14-0-1 =14-1-2 =4+0-3=8-1 =16-11-4=19-3-7 =16-12 + 15 =17-6 =13 1 + 3 =20-17 + 16 =13-4 + 7 =15-8 =11 1 =2 + 8 =3 + 12 + 5 =10-4-4 =6 2 + 11 =1 + 3 + 14 =0+2+3=14-4 +
12、 8 =1-1+1=11 + 7-13 =11-7 + 14 =19-18 =4 + 13 =19-18 =6+7-5=3-0-0=3 + 11-13 =3 + 10 + 1 = 13-3 + 3 =19-2 =7+36=1646 =19-18 =5 + 10-2 =5-5 =15 + 5 =5+3+4=0 + 13 =19-16 =18-0 =8 + 2 =8-0 =1+4+0=55+8=1-0 =6 + 14 =3 + 11 =9-8 =5-30=14+0 =3 + 11 =12-10 =0 + 8 =17-7-7 =14-0 =7-2 =1 + 1 + 18 =18-6 =I + 9 =
13、6+1+4=5-1-4=8-5 =6-3-0=19-4-2 =14+0-8 =14+5 + 1 =5+69=6+3=II + 8-17 =3 + 13 =9+46=6 + 1 =0 + 0=7-4 =19-2 =19-19 =10-9 =15-15 =12 + 5 =8-5 =1 + 2 + 16 =2 + 6 =4+4+3=15+4 =19-3 =18-4-14 =8 2 =9 + 3 =17 + 1 =18-15-2 =4 + 0+15 =13-3 =18+0 =13+4 =8 + 3 =17-16+11 =13-5-5 =5+4+1=8-8 =0 + 15-5 =9+65=7+6+4=7
14、-5 + 15 =3 + 2 =8-7+4=12-10+4 =14 + 1 =20-17 + 15 =0 + 16 =19-9-8 =5+1+5=4 + 15 =10 + 5 =4 + 10-7 =2+1+7=2+4+6=1+93=17 + 0 =19-12-2 =20-1-0 =10+5 =20-13 =4+4+2=6 + 13 =18-17 =6 + 4=13 + 7 =2-2 + 19 =7+06=1 + 3 =11 + 2 =1+42=13-0 =16+4 =19-19 =17-2-1 =15+4 8 =10-7 + 7 =10-7 + 10 =0 + 3 =4 + 13 - 2 =1
15、1-11 =0 + 13 + 6 =19-2 =17-16 + 8 =8-5 =16-13 =0 + 13 + 2 =3 + 15 + 2 =18-3 =16-9-7 =15-6 =13-0-6 =8 + 0=1 + 2 =7+3+3=20-16 + 14 =0+1+7=9+3-1=20-12-3 =7+1-0=11-11 =0 + 9 + 1O =5+7+6=60+12 =15-3-2 =12 + 7-17 =3 + 11 =9-1+5=5 + 15 =146 + 5 =2-1 =7+72=15-14+7 =2 + 15 =19-5-8 =8-0=6 + 10-12 =2 + 11 =17
16、6 6 =5 4+14 =19-1-11 =19-2-3 =0 + 20 =10+1 =5 + 11 =53+1=1+4 + 13 =63 =20-10 =19-7 =1 + 11-7 =15-1 =13-7 =15 9 + 5 =20-19 + 3 =20-3-17 =20-20 =12 + 0 =18-3-4 =6-1-4=12-6 =8 + 11 =13-0-7 =15-9 + 8 =4 + 15 =14-10 =7-3 =8-0+1=3 + 16 + 0 =1 + 0 + 10 =19-4 =41+2=11-4-6 =13 + 3 3 =o-=10+6 =7+1-0=20-19 =5
17、+ 13-1 =O-O=14-9 + 7 =11-4 + 5 =19-2 =19-2 + 1 =0 + 19 =5 5 =14+5-3 =12 + 2 =19-4-13 =6O615-2-4 =1 + 13 + 0 =9+6O=4 1 + 14 =2-2 =17-10-0 =19-5 =13-11 + 14 =16-7 =10-1-8 =164 + 6 =6 + 2 =15-15 =19-16 + 2 =13-6 + 3 =42+4=10 + 6 =16-9 + 11 =7-6=2 + 10-7 =5 + 2 =4 + 4=12-8 + 9 =1 + 13 + 6 =14-14 =11-2-0
18、 =16-1 =202 =1 + 8 =13-3-4 =12 + 7 =17-1 =3 + 12+4 =19-9 =9 + 1O =1+9-0=4-2 =18-6 =8+1+2=7-7+4=20-6-8 =2 + 6 =164+4 =20-1-14=17-11-6 =4-0+5=11+4+4 =7 + 11 =19-15 =13+0 + 5 =14 8 3 =0 + 15 + 4 =65 =2 + 16 + 2 =9 + 6 =7 + 8 12 =15-0-2 =-o+o=20 + 0 =2+4=8 + 10-15 =15-0-4 =12 + 0 =99 =4+5-7=12 + 2+4 =5
19、+ 4=4 + 10-4 =20-2O =7 4=7 + 9 =6 + 8 11 =7 + 1 =17-2 =2 + 10-8 =5-3-1=14-0-11 =16-10 =5 + 15 =19-15 =6+99=0 + 3 =4 + 5 =19-6-8 =20-4-15 =11 + 1-12 =7 + 12 =16 + 3 =20-20 =15-3 =1+0+3=2 + 6 =11-0-10 =17-13-0 =7+2+1=8+3+3=4 +16 =13-8 + 0 =17-10-2 =18-6 =19-1-1 =20-20 + 8 =4 + 5 =6+1+6=15-8-6 =12-8 +
20、15 =4 + 4=9+58=76+1=20-O =83+9=16-16 =16-9-4 =3-1 =18 9 + 0 =20-4-10 =16 + 3-7 =1 + 8 =2 + 10+4 =19-6-3 =15+4-2 =17-4-12 =9 + 7 15 =19-0 =5-5 + 20 =14-14+7 =15-3 =16-0 =60+8=5 + 11-9 =18-13 + 8 =9 7 + 13 =9-1 =10+0 =8+38=13 + 7 =9-2 =0 + 11 + 8 =7+9+3=18 + 1 =0 + 5 =3 + 12 =8+2+4=17-13 =8一8 =8 8 + 1
21、7 =15-15 + 1 =18-17 + 17 =2+9+3=20-12 =7-4+0=3 + 15 =2+9+2=1 + 11 =16-13 =11-11 =12-10 =12+4 =20-17-2 =7+5+6=5+4 =15+0 =18-16 =10 + 3-4 =18-7 =12+4 =10-5 + 3 =3-0=17-6-9 =20-19 + 0 =7-2 =166 - 6 =9-6 =6 + 9 =8-2 =85+1=17-3-0 =14-3 =12-11 + 8 =5 + 10 =3 + 10 + 0 =64=2+4+0=14+1 =12+0 =8+4+3=64+9=10-10
22、 =19-6 =18-14=3 + 14 + 1 =12-3 =16-3-9 =5 + 1 + 13 =20-11 + 10 =20-13 =18-15 =10 + 7-5 =19-6 =1-0-1=13-6 + 10 =16-2-1 =19-16-1 =4 + 4=13 + 1-14 =30+7=9 + 5-12 =13-0 =14-2 =9 + 10-15 =1 + 13 =13-7 + 10 =18-4 =19-13 + 5 =8-1 =19-2-5 =13-13 =3 + 6 =6+4-5=8 + 12 =8-7 =20-8-12 =1 + 0=10 + 8 =19-4-6 =2 +
23、18 =7+1+0=1 + 12-5 =6 - 1 -0 + 15 + 0 =6 - 2 -15-5 =19-15-3 =17-2 =11-2-6 =4+7+2=12-4 + 5 =5 + 11 =15 + 3 =6 + 1O =2 + 12 =10-5 =6 + 14 =18-17 + 2 =13+4 =18-18 =14-14=7-0-7=0+4+2=0 + 13-3 =17-9-8 =134 =5-1 =16-0-9 =4-2 =2 + 17 8 =2-1 =18-3 =20 12 =9 + 9 =9+4 =6 + 11 =6 + 3 + 11 =1 + 2 =7 + 6 =3 + 8
24、=13 + 2-5 =7 + 11 =8 + 2 =64 =5 2 =18-2 =15-5 =0 + 10 =17 + 2 =9+2+8=8-0 =18-5-6 =12 + 6 13 =7+5-1=0 + 3 + 17 =4 + 13 =6 + 14 =19-2 =12+0 =14-3-6 =14 + 2 =11 + 8-11 =14-5 =12 6 - 6 =18-1-11 =12-2 =17-2-3 =2 + 15-3 =1 + 18 =15-12 =1 + 11 =1 + 12 =20-2-9 =13 + 7 =15 + 5 =0-0 + 15 =17-11 =12-2 + 4 =12-
25、11 + 18 =18-11 =32 =18 + 0 =7-0 =2 + 2 =17-15 =15-14 =4-3 =9-2 =0 + 20 =3 + 14 + 0 =18-6 =55 =10-0 =12-6 =18-11 + 1 =10-5-4 =19 19 =1+1+3=1 + 6 =0 + 12 =4 + 1 =7 + 5 =9-6-2=2 + 7 =5 + 4=13+4 =17-6 + 9 =4+2-4=12-12 =4 + 15 =4 + 0 + 16 =o-=2 + 12 + 3 =3 + 3 =2 + 12 =12 + 3 =4 + 144 =64=10 + 9 =7 + 2 =
26、6 + 6 =1 + 0=19 + 1 =3 + 14 + 3 =3 + 12 + 3 =16-1 =16-16 =12-0 + 2 =2 + 15-10 =13 2 + 2 =14-7 + 8 =74+5=1-1 =8+9-0=18-13 + 10 =3-1-1=18-15-3 =16-12 =19-1 =3+638 + 10-12 =6+1+3=11-0-4 =19-15 =6+3-5=11 5 + 4 =3 + 9 =14-6-1 =19-1-12 =17-7-1 =5-5 =18-2 =19 6 =3 + 10 =8-5 =15-11 + 9 =3 + 12-12 =18-17 + 1
27、 =5-0 =0+8-2=16-7-5 =16-11 + 11 =3+3+6=93+6=17-9-6 =0 + 0=10-8 + 7 =17-5 + 5 =0+8+0=9 + 5 =20-13 + 6 =15-12 =9 + 1-10 =14+4 + 0 =18-5 + 3 =5 + 12 =7+3-0=15+4 =10 + 1 + 2 =13-2 =19-7-3 =15-11 + 3 =4 + 11-14 =6 6 =16 1 =1 + 9 =17-17 =4 + 9 =17-0 =12-12 =3 + 12 =6+1-5=13-2 =5 0=15-5 =18-13 =14-9-2 =7 +
28、 0=0+3-1=3 + 2 + 15 =7-0 + 11 =145 + 8 =8 + 10 =8 8 =3 + 6 =205 5 =0 + 11 =4+1+5=15-2 =15-2-7 =15-15 =9-3-3=7-7 + 11 =11-5 =7-3 + 10 =13-13 =10-9 + 0 =18 2 9 =6 + 13-16 =11+0 =2-1 =15 + 2 + 0 =7 + 11 =14-4 9 =13-2 + 8 =145 + 9 =19+0 =7-6 + 18 =16-7 + 6 =2 + 18 + 0 =20-11-3 =4 + 14 =1 + 19 =11 + 6 =1
29、1-1 =14-5 =10-7 + 1 =16 5 + 5 =15-5-0 =0 + 8 =9+3+6=30+2=10-5-4 =19-19 + 19 =0 + 1 =9 1 =15-9-4 =7 + 1 =13 + 6-3 =3 + 10 + 5 =14-8-0 =7 + 1O =8-5 =42 =4 + 3 =15-0-7 =5 + 3 =3 + 2 =6 + 10 =19-5 =19-4 =9 + 1O =13-3 + 0 =20-12 + 8 =7-1 =11 + 8-6 =18-9-9 =17-5-3 =13 + 0 + 3 =0+4=76+4=15 9 + 7 =20-16-4 =
30、3 + 12 + 0 =14 + 1-5 =12+0 =7 4 =19-4 =12 + 8 =o+o-o=12-11 =1 + 14 =1 + 11 =5 + 6 =16-7-9 =17-0 =1 + 19 =8 + 11 =3 2 + 14 =9-4-0=81+9=11 + 3 =14-2 + 7 =11 + 0 =11+0 + 7 =2 + 11 =8 + 3 =1 + 7 =11-6 =2 + 18 =10-3 + 8 =6 + 13-19 =7-5 + 13 =200 8 =19-6-7 =4-3 =18-0-7 =8 + 10 8 =14-8 + 13 =15-10 =144 =4+
31、8+8=4 + 13-12 =7 + 5 =11-0 =12 + 1 =20-3 =19-11 =12-10 =12-12 =11 + 7 =0 + 6 + 11 =9-8-0=1 + 0=7-6 =7 + 0=17-10+6 =3+6+8=5 + 4=9-9 =17-11 =17-9 + 6 =4 + 1 =8+1+4=16+4 =11-3-0 =16-0-12 =13-12 + 10 =11-3 + 10 =12-5-5 =10 + 9 =5 + 13 =10 + 3 =4 + 6 =9-0 =16-10 + 11 =7-1-6=18-13 + 0 =16 + 1-15 =16-1 =0
32、+ 9 =200 3 =0-0+7=2 + 17 =0 + 19-9 =1 + 4=17-7-9 =11 + 0 + 6 =3 + 15 =11-2 =20-15-1 =18-15 + 0=7-4 =5+2+5=8 + 104 =13 + 7=3 + 1 =4 + 1 =6+1+6=14 + 0 + 0 =19-12 =16-2-7 =9 + 1 =6 + 9 =13-11 =8-3 + 10 =10 + 9 =19-14 =2+7+8=2 + 16 =14-8 =15-12-0 =7 + 13 =10+4 =1+5+7=4-0 + 11 =17 + 1 =2 + 4=20-O =20-7-1
33、1 =9-3-5=1 + 12 =2 + 8 =8+69=9+3+2=17-1-9 =7+4+8=1 + 19 =12-2-6 =1+0+9=16 + 3 + 1 =18-10 =5-0-1=8+3-7=164 19-4-11 =16-3-1 =4+3+9=6+9+=3 + 10-9 =8-7 =14-13 + 9 =5 4 =20 + 0 =4 + 10 + 6 =18-0 =5 + 0 =4 + 1 + 15 =13+4-9 =6-0 + 13 =11-1 =15-12 =13-3-4 =20-9-0 =1046 =11 + 0 + 4 =18-13-1 =184 8 =3 + 16 =5
34、 + 0=20-10-10 =10-3 + 12 =16-15 =15 + 1 =5 + 6-10 =16-15 =10-5 + 12 =3 + 15-17 =14-13 + 11 =15-3 =14 8 6 =1+2+2=20-14+9 =7-3 =4 + 1 + 15 =15-15 =8+5+5=5-5 =42 =20-1 =9 + 9-18 =3-1 =13-5-8 =12 + 0-7 =1 + 13-12 =4+5-7=17-12-3 =9+84=0 + 3 + 15 =13-0 =15 + 0 + 2 =3 + 2 =5-o-O=4 + 5 + 11 =15-2 + 2 =6 + 1
35、0 =16-12 =15-13-1 =20-2-17 =3+2+6=13-5-0 =16-14+17 =0 + 18-9 =80+8=9+21=0 + 10 + 2 =18 16+4 =1+4+6=15-4 + 8 =18-4 + 2 =5-2 =11 9 + 8 =14+4-II =3 + 15 =4 + 11 =11-3-6 =6 3 =17-5-6 =18-12 + 9 =164 =9-5-1=12-3 =14-3 =5 + 12 - 9 =20-9-2 =6 + 11 =3 + 7 =19-9 + 1 =7 + 0 =13-1-0 =12 + 2 =17 + 0-11 =12-3 =2
36、 + 8 =7-6 =13-6 =8+3+8=5 + 1 + 14 =7-3+6=7-4=5+7+3=4 + 13-15 =2 + 16 =14-14 =0+8+9=10+10 =6 2 =19 6 + 3 =19-17 + 14=12-0-5 =13 + 5 =15-11 =6-2-3=1+8+4=9 + 5 =2-1 =16-12 + 2 =85+2=1+9+2=13-2 =19-9 =20-15 =7 + 1 =8 + 0=17-10 =1 + 10 =16-5 =3+2+4=3-3 =2 + 17 =14-13 =13-1 + 7 =17-4 =7+1+4=0+607-4 =1 + 1
37、7-2 =17-13-0 =2 + 11 + 3 =14+0 =17-8-8 =16-6 + 7 =17-2-3 =4 + 14 =12+4 =8+63=16-0-13 =15-14=13-13 =0 + 18 =19-19 =15 5 3 =0+72=0 + 6 =8 8 + 16 =19-15-2 =14-3 + 1 =0 + 5 =3 + 13-4 =12 + 7 =5+92=16-1 =75+3=17-9 =2 + 1 =17+0 =4 + 3 =20-8-1 =11+4-5 =20-11 =12+4+4 =1+1-0=14-14=5-1 + 11 =19-0 =18-13-4 =18
38、-14+4 =17-12 =19-8 =83+2=19-15 + 5 =6 + 11 =7-0-5=15-14+5 =16-0 =12 + 2 + 0 =20-12 =2 + 4=11 + 1-6 =8 6 9+31=14-11-0 =13 + 0 =4-1 + 10 =10-6 + 11 =19-10-5 =7-7 + 11 =3 + 14 =12 + 6 =4 + 11-9 =16-12 =15-5 =11 + 6 =0 + 16 - 6 =4-3 =10 + 3 =7+8+1=1 + 11 =18-7 =10 + 1 =8+3+5=18 + 0 =13-1 + 4 =10-1 =15-10 =6 + 10 =6-1 -8 + 7 =19-2 =10 + 5 =3 + 14-15 =19-2 =7-3 =2 + 13 3 =1 + 18 =15 + 1 =6 4 + 13 =5 5 =18-8-0 =11 + 3 =11 + 3 + 2 =6 + 2 =14+5-3 =12 + 2 =19-4-13 =6O615-2-4 =1 + 13 + 0 =9+6O=4 1 + 14 =2-2 =17-10-0 =19-5 =13-11 + 14 =16-7 =10-1
