8+411 8+213-3
220 18-107 8+7 7+7
76 910 8-22 37-3
6+34+5 13-41+3 8-08+0
7+717-7 16-516-4 12-48+4
17-912 16+2-98+3 18-27+6 15+29+3+5
4□ 5□ 6□
9-4-3=2