7.5÷1.5=
7.8×0.2=
0.4y+0.6y=
0.4-0.4÷2=
4.5×99+4.5=
6×0.5÷6×0.5=
1-=
-=
+=
=
4-1.6=
3.6÷2=
1-=
0.1-0.01=
15+1.45=
+=
0.5×0.8=
3.5+0.7=
1.5×3=
3+4×0.2=