1-+=
1÷×=
0.5-+0.5-=
÷75%=
(+)×24=
7÷×7÷=
100÷50%=
10.2+80%=
0.5×0.1÷0.5=
+70%= 0.252= ×÷×= :=
+=
-=
×=
40×0.3=
12÷2.5=
3.14×9=
3.14×7=