面积是平方厘米
100-0.4=
1÷9=
0.125×80=
0.86+0.4=
+ =
- =
× =
0.1÷ =
( ﹣ )×18
÷ ÷
2.6× +2.4÷
1﹣ ÷( + )
: =6:x
(图上1格的线段代表100米,“•”代表起点)