6-1= 2+4= 4+3= 9-4=
2+2= 8-3= 6-5= 2+5=
3-1= 9+0= 2+6= 8-1=
4+4= 3+1= 7-5= 3+6=
4-2=□
5-3=□
5+7= ( )
8-3= ( )
○○○○
10-47-4 8-49-3 8-28+2
6-05-1 2-29-9 10-99-1
4-=3
+2=7
+=7
0+=
+3=9
①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣