78-=8 65+=85 94-=88
+50=68 -20=40 +7=63
64+30= 100-9= 74+3= 28+12=
44+56= 36+54= 99-60= 9+60=
8+45= 61+23= 23+52= 24+12=
①66-48=
②45+34=
③37+63=
④42-26=
⑤60-19=
⑥76+15=