①
②
③
63=
6×3=
6+6+6=
2.3×1.9=
0.5×0.5=
6.7×0.25=
5.13÷3=
29÷18=
+=
-=
3-=
0.8+=
×18=
×=
3.2×=
0.38 2.56
x-= 1-x= 4x-0.2=6