8+2230 1元90分 43-620+19
56-256-20 8元8分8元8角 12-5+412-(5+4)
83-=43 32+=40 -20<28
+30=74 -9=35 62-=56+
41+839
45+3040+35
84-775
38+4081-9
82-4051-9
66+786-8
14-7=
54-50=
15-8=
80-(56-26)=
36+4=
36+20=
53-7=
20+(17-8)=
83-3=
63-9=
37+9=
56+(16-6)=