①17-5-7=
②18-8+9=
③9+8-10=
④11+9-5=
⑤15+5-5=
⑥20-10+9=
⑦16-5+1=
⑧13+5-9=
⑨11+0+7=
⑩4+9+3=
12-3= 13-7+5= 3+9+2= 15-8+3=
12-5= 8+3-5= 12-3-4= 17-5+4=
12-4= 14-7+8= 6+7-4= 16-3-8=
13-7= 13-6= 13-5= 13-5+6=