7.8÷0.2=
×2-3.5=
12×(-)=
-+=
4×(1-10%)=
-62.5%=
+50%=
÷+×2=
0.32=
- =
0.2×0.4=
1-0.09=
1÷×=
9.34+6.6=
×3÷×3=