300﹣187=
7.2÷36=
8.63+5=
4.7×100=
2600﹣279﹣321=
+=
×=
72÷=
-=
××=
20÷=
16×0.1=
4.3×798×0=
×7.2=
6×-×5=
19+23=
5﹣1.6=
0.23÷0.1=
0.4×0.2=
=
÷0.25=
○
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□