0.32-0.22=
0.75-=
-=
+=
1-+=
5-=
1-3÷8=
++=
2
3
6
10
8
﹣1 0.00010 × 0.75×800.75×800
0.3 1﹣ ﹣﹣ 1.5÷0.61.5×
1×1÷ 12亿203000000 428