3+=
0.8-=
1.2+=
-0.125=
-=
1-=
+=
4+=
=
+=
8×7×1.25= 2─=
32 + 42= 3.25÷0.25 =
420+590= 72÷3= 0.8×4=
0.24+0.8= 1.1-0.11= 3.2+0.15= 0÷4.5=