①10-5+9=
②7+3+7=
③1+6+8=
④7+7-2=
⑤9-2+6=
⑥15-5-8=
2+9= 8+5= 9+5= 5+7= 4+8=
5-3+8= 12+2-3= 8+9-10= 2+7+3=