月份
1
2
3
用水量/吨
12
15
13
5.34+0.66=
101×30=
0.4+6.0=
+=
5÷0.05=
×=
-=
13÷=
54×=
× =
6﹣4.92=
25×0.7×4=
+0.5=
3- =
6.3÷0.21=
1﹣1÷ =
(0.6- )×16=