= = = =
+=
×=
1-=
+2=
×0=
-=
17.2+2.8=
0.6×0.9=
8÷0.8=
0.25a+0.5a=
123÷100=
0.74×100=
2.7÷3=
3-1.48=
0.25a+0.05×2=
6÷=
6×=
10×=
3÷=
÷=
1÷0.125=